Update Dockerfile

Dockerfile

@@ -1,8 +1,11 @@
 FROM ubuntu:latest
 
-RUN apt-add-repository ppa:i2p-maintainers/i2p
-RUN apt-get update && apt-get install -y git golang-go build-essential i2p wireguard socat
-
+RUN apt-get update && \
+    apt-get install -y software-properties-common && \
+    apt-add-repository ppa:i2p-maintainers/i2p && \
+    apt-get update && \
+    apt-get install -y git golang-go build-essential i2p socat
+    
 RUN mkdir -p /app/t
 
 WORKDIR /app