M1MacでDocker環境にnode-sass入れようとしたらエラー出たから解決した

# はじめに
環境を新しくしようとM1Mac買って(安かったから)ウキウキしながら開発を再構築していたら、node-sass周りでエラーになりやがりまして解決した時のやり方です。

# 前提
以下のようなdockerファイルでnode環境にnode-sass(Ver4.14.1)を入れようとしています。
他にももちろん入れようとしていますが、node-sass周り以外のエラーはなかったので、問題ないもしくは同様の対処で問題が解消されたようです。

``` Dockerfile
# 使用するDokcerfile
FROM node:12.10-slim

RUN mkdir /workspace
COPY ./package.json /workspace/package.json

WORKDIR /workspace
RUN npm install
```


ただ、最初に出たエラーは以下のように404エラーだったんですが、今日やったら別のエラーになっていました。これについては謎ですが、一時的な問題だったのかもしれません。

```
# 最初に出たエラー
Cannot download "https://github.com/sass/node-sass/releases/download/v4.14.1/linux-arm64-72_binding.node": 
```

```
# 記事書いた日に出たエラー
#11 18.16 > node-sass@4.14.1 postinstall /workspace/node_modules/node-sass
#11 18.16 > node scripts/build.js
#11 18.16 
#11 18.23 Building: /usr/local/bin/node /workspace/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
#11 18.27 gyp info it worked if it ends with ok
#11 18.27 gyp verb cli [
#11 18.27 gyp verb cli   '/usr/local/bin/node',
#11 18.27 gyp verb cli   '/workspace/node_modules/node-gyp/bin/node-gyp.js',
#11 18.27 gyp verb cli   'rebuild',
#11 18.27 gyp verb cli   '--verbose',
#11 18.27 gyp verb cli   '--libsass_ext=',
#11 18.27 gyp verb cli   '--libsass_cflags=',
#11 18.27 gyp verb cli   '--libsass_ldflags=',
#11 18.27 gyp verb cli   '--libsass_library='
#11 18.27 gyp verb cli ]
#11 18.27 gyp info using node-gyp@3.8.0
#11 18.27 gyp info using node@12.10.0 | linux | arm64
#11 18.27 gyp verb command rebuild []
#11 18.27 gyp verb command clean []
#11 18.27 gyp verb clean removing "build" directory
#11 18.27 gyp verb command configure []
#11 18.28 gyp verb check python checking for Python executable "python2" in the PATH
#11 18.28 gyp verb `which` failed Error: not found: python2
#11 18.28 gyp verb `which` failed     at getNotFoundError (/workspace/node_modules/which/which.js:13:12)
#11 18.28 gyp verb `which` failed     at F (/workspace/node_modules/which/which.js:68:19)
#11 18.28 gyp verb `which` failed     at E (/workspace/node_modules/which/which.js:80:29)
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/which/which.js:89:16
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/index.js:42:5
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/mode.js:8:5
#11 18.28 gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:169:21)
#11 18.28 gyp verb `which` failed  python2 Error: not found: python2
#11 18.28 gyp verb `which` failed     at getNotFoundError (/workspace/node_modules/which/which.js:13:12)
#11 18.28 gyp verb `which` failed     at F (/workspace/node_modules/which/which.js:68:19)
#11 18.28 gyp verb `which` failed     at E (/workspace/node_modules/which/which.js:80:29)
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/which/which.js:89:16
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/index.js:42:5
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/mode.js:8:5
#11 18.28 gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:169:21) {
#11 18.28 gyp verb `which` failed   stack: 'Error: not found: python2\n' +
#11 18.28 gyp verb `which` failed     '    at getNotFoundError (/workspace/node_modules/which/which.js:13:12)\n' +
#11 18.28 gyp verb `which` failed     '    at F (/workspace/node_modules/which/which.js:68:19)\n' +
#11 18.28 gyp verb `which` failed     '    at E (/workspace/node_modules/which/which.js:80:29)\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/which/which.js:89:16\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/isexe/index.js:42:5\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/isexe/mode.js:8:5\n' +
#11 18.28 gyp verb `which` failed     '    at FSReqCallback.oncomplete (fs.js:169:21)',
#11 18.28 gyp verb `which` failed   code: 'ENOENT'
#11 18.28 gyp verb `which` failed }
#11 18.28 gyp verb check python checking for Python executable "python" in the PATH
#11 18.28 gyp verb `which` failed Error: not found: python
#11 18.28 gyp verb `which` failed     at getNotFoundError (/workspace/node_modules/which/which.js:13:12)
#11 18.28 gyp verb `which` failed     at F (/workspace/node_modules/which/which.js:68:19)
#11 18.28 gyp verb `which` failed     at E (/workspace/node_modules/which/which.js:80:29)
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/which/which.js:89:16
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/index.js:42:5
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/mode.js:8:5
#11 18.28 gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:169:21)
#11 18.28 gyp verb `which` failed  python Error: not found: python
#11 18.28 gyp verb `which` failed     at getNotFoundError (/workspace/node_modules/which/which.js:13:12)
#11 18.28 gyp verb `which` failed     at F (/workspace/node_modules/which/which.js:68:19)
#11 18.28 gyp verb `which` failed     at E (/workspace/node_modules/which/which.js:80:29)
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/which/which.js:89:16
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/index.js:42:5
#11 18.28 gyp verb `which` failed     at /workspace/node_modules/isexe/mode.js:8:5
#11 18.28 gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:169:21) {
#11 18.28 gyp verb `which` failed   stack: 'Error: not found: python\n' +
#11 18.28 gyp verb `which` failed     '    at getNotFoundError (/workspace/node_modules/which/which.js:13:12)\n' +
#11 18.28 gyp verb `which` failed     '    at F (/workspace/node_modules/which/which.js:68:19)\n' +
#11 18.28 gyp verb `which` failed     '    at E (/workspace/node_modules/which/which.js:80:29)\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/which/which.js:89:16\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/isexe/index.js:42:5\n' +
#11 18.28 gyp verb `which` failed     '    at /workspace/node_modules/isexe/mode.js:8:5\n' +
#11 18.28 gyp verb `which` failed     '    at FSReqCallback.oncomplete (fs.js:169:21)',
#11 18.29 gyp verb `which` failed   code: 'ENOENT'
#11 18.29 gyp verb `which` failed }
#11 18.29 gyp ERR! configure error 
#11 18.29 gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
#11 18.29 gyp ERR! stack     at PythonFinder.failNoPython (/workspace/node_modules/node-gyp/lib/configure.js:484:19)
#11 18.29 gyp ERR! stack     at PythonFinder.<anonymous> (/workspace/node_modules/node-gyp/lib/configure.js:406:16)
#11 18.29 gyp ERR! stack     at F (/workspace/node_modules/which/which.js:68:16)
#11 18.29 gyp ERR! stack     at E (/workspace/node_modules/which/which.js:80:29)
#11 18.29 gyp ERR! stack     at /workspace/node_modules/which/which.js:89:16
#11 18.29 gyp ERR! stack     at /workspace/node_modules/isexe/index.js:42:5
#11 18.29 gyp ERR! stack     at /workspace/node_modules/isexe/mode.js:8:5
#11 18.29 gyp ERR! stack     at FSReqCallback.oncomplete (fs.js:169:21)
#11 18.29 gyp ERR! System Linux 5.10.47-linuxkit
#11 18.29 gyp ERR! command "/usr/local/bin/node" "/workspace/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
#11 18.29 gyp ERR! cwd /workspace/node_modules/node-sass
#11 18.29 gyp ERR! node -v v12.10.0
#11 18.29 gyp ERR! node-gyp -v v3.8.0
#11 18.29 gyp ERR! not ok 
#11 18.29 Build failed with error code: 1
#11 18.48 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules/chokidar/node_modules/fsevents):
#11 18.48 npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm64"})
```

# 解決方法
なぜかM1Macで入れたnodeのコンテナにはpython環境とついでにmake環境がないようなので、コマンドで入れてあげればOKです。
最終的に使用したDockerfileは以下のようになっています。

``` Dockerfile
FROM node:12.10-slim

RUN mkdir /workspace
COPY ./package.json /workspace/package.json

RUN apt-get update || : && apt-get install python build-essential -y

WORKDIR /workspace
RUN npm install
```

# ちなみに
Intel入ってる方でも動作確認済みです。

# alpine環境の場合
apkコマンドで入れるケースがあったので、その時のコマンドも載せておきます。

```
apk update && apk add python make gcc g++
```