let Phoenix version and NodeJS versions be build arguments, only run …

…GH action on tags

.github/workflows/image.yml

@@ -2,8 +2,10 @@ name: Build nicbet/phoenix
 
 on:
   push:
-    branches: master
-
+    branches:
+      - "!*"
+    tags:
+      - "v*"
 jobs:
   build:
     runs-on: ubuntu-latest

Dockerfile

@@ -1,18 +1,22 @@
 FROM elixir:1.12.3
 
+# Build Args
+ARG PHOENIX_VERSION=1.6.2
+ARG NODEJS_VERSION=16.x
+
 # Apt
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install -y apt-utils
 RUN apt-get install -y build-essential
 RUN apt-get install -y inotify-tools
 
 # Nodejs
-RUN curl -sL https://deb.nodesource.com/setup_16.x | bash
+RUN curl -sL https://deb.nodesource.com/setup_${NODEJS_VERSION} | bash
 RUN apt-get install -y nodejs
 
 # Phoenix
 RUN mix local.hex --force
-RUN mix archive.install --force hex phx_new 1.6.2
+RUN mix archive.install --force hex phx_new #{PHOENIX_VERSION}
 RUN mix local.rebar --force
 
 # App Directory