Repository: containrrr/watchtower (go)

Issue:
watchtower ignores mounted /etc/timezone file
**Describe the bug**
using docker compose, mounted volume for /etc/timezone is ignored

**To Reproduce**

```
volumes:
  - '/etc/timezone:/etc/timezone:ro'
```

**Expected behavior**
Expect to see watchtower operate in mounted timezone in notification timestamps and schedule checking.

**Environment**
 - ubuntu 18.04 LTS
 - x86
 - Docker version 20.10.5, build 55c4c88
 - containrrr/watchtower             latest       c992dfdeb81b   4 days ago      16.3MB
 - timezone is "America/Chicago" in my case

**Additional context**
watchtower operates in correct timezone if environmental variable TZ is set.

Pull request description:
docs: suggest mounting localtime, not timezone
The current docs suggests mounting the hosts /etc/timezone into the watchtower container, but that has no effect.

`/etc/localtime` is usually a symlink to `/usr/share/zoneinfo/<contents of /etc/timezone>`, but that symlink has to be created. So whatever is in `/etc/timezone` does not affect the actual tz database being used in watchtower, and since the image is a base image, no service that updates that symlink ever runs.

Instead, this would change the docs to suggest directly mounting the hosts `/etc/localtime` file.

Fixes #876 

Patch:
diff --git a/.github/workflows/release-dev.yaml b/.github/workflows/release-dev.yaml
index 5005b2e..7928e45 100644
--- a/.github/workflows/release-dev.yaml
+++ b/.github/workflows/release-dev.yaml
@@ -1,23 +1,47 @@
-name: Release (Develop)
+name: Push to main
 
 on:
+  workflow_dispatch: {}
   push:
     branches:
       - main
 
 jobs:
-
   build:
-
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v2
-
-    - uses: jerray/publish-docker-action@master
-      with:
-        username: ${{ secrets.DOCKERHUB_USERNAME }}
-        password: ${{ secrets.DOCKERHUB_PASSWORD }}
-        file: dockerfiles/Dockerfile.self-contained
-        repository: containrrr/watchtower
-        tags: latest-dev
+      - uses: actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: Build
+        run: go build -v ./...
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: Test
+        run: go test -v -coverprofile coverage.out -covermode atomic ./... 
+      - name: Publish coverage
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+  publish:
+    needs:
+      - build
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: jerray/publish-docker-action@master
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          file: dockerfiles/Dockerfile.self-contained
+          repository: containrrr/watchtower
+          tags: latest-dev
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3083abb..de72102 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,6 +1,7 @@
 name: Release (Production)
 
 on:
+  workflow_dispatch: {}
   release:
     types:
       - created
diff --git a/docs/arguments.md b/docs/arguments.md
index 01de345..70efc21 100644
--- a/docs/arguments.md
+++ b/docs/arguments.md
@@ -39,7 +39,7 @@ Environment Variable: N/A
 
 ## Time Zone
 Sets the time zone to be used by WatchTower's logs and the optional Cron scheduling argument (--schedule). If this environment variable is not set, Watchtower will use the default time zone: UTC.
-To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezone can alternatively be set by volume mounting your hosts /etc/timezone file. `-v /etc/timezone:/etc/timezone:ro`
+To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezone can alternatively be set by volume mounting your hosts /etc/localtime file. `-v /etc/localtime:/etc/localtime:ro`
 
 ```
             Argument: N/A
diff --git a/mkdocs.yml b/mkdocs.yml
index b40f794..67529aa 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -1,7 +1,7 @@
 site_name: Watchtower
 site_url: http://containrrr.github.io/watchtower/
 repo_url: https://github.com/containrrr/watchtower/
-edit_uri: edit/main/docs/index.md
+edit_uri: edit/main/docs/
 theme:
   name: 'material'
   palette:
diff --git a/pkg/notifications/notifier.go b/pkg/notifications/notifier.go
index b9e322e..ec313a5 100644
--- a/pkg/notifications/notifier.go
+++ b/pkg/notifications/notifier.go
@@ -55,6 +55,12 @@ func (n *Notifier) String() string {
 			sb.WriteString(", ")
 		}
 	}
+
+	if sb.Len() < 2 {
+		// No notification services are configured, return early as the separator strip is not applicable
+		return "none"
+	}
+
 	names := sb.String()
 
 	// remove the last separator


Test patch:
diff --git a/pkg/notifications/notifier_test.go b/pkg/notifications/notifier_test.go
index 5ef75a0..ecd228f 100644
--- a/pkg/notifications/notifier_test.go
+++ b/pkg/notifications/notifier_test.go
@@ -23,6 +23,22 @@ func TestActions(t *testing.T) {
 }
 
 var _ = Describe("notifications", func() {
+	Describe("the notifier", func() {
+		When("only empty notifier types are provided", func() {
+
+			command := cmd.NewRootCommand()
+			flags.RegisterNotificationFlags(command)
+
+			err := command.ParseFlags([]string{
+				"--notifications",
+				"shoutrrr",
+			})
+			Expect(err).NotTo(HaveOccurred())
+			notif := notifications.NewNotifier(command)
+
+			Expect(notif.String()).To(Equal("none"))
+		})
+	})
 	Describe("the slack notifier", func() {
 		builderFn := notifications.NewSlackNotifier