feat: allow for the installation of plugins

Dockerfile

@@ -1,13 +1,15 @@
 FROM node:lts-alpine
 RUN apk update && apk add git
-RUN npm install -g semantic-release@17.0.7 \
+RUN npm install -g semantic-release@17.1.1 \
   @semantic-release/commit-analyzer@8.0.1 \
   @semantic-release/release-notes-generator@9.0.1 \
-  @semantic-release/github@7.0.5 \
+  @semantic-release/github@7.0.7 \
   @semantic-release/npm@7.0.5 \
   @semantic-release/exec@5.0.0 \
   @semantic-release/changelog@5.0.1 \
   @semantic-release/git@9.0.0 \
   @semantic-release/gitlab@6.0.4
 RUN apk add --update make \
-  && rm -rf /var/cache/apk/*
+  && rm -rf /var/cache/apk/*
+COPY *.sh /
+RUN chmod +x /main.sh /setup.sh

action.yml

@@ -8,10 +8,15 @@ inputs:
     description: 'Github token for pushing releases'
     required: true
     default: ''
+  plugins:
+    description: 'Space separated semantic-release plugins to install'
+    required: false
+    default: ''
 runs:
   using: 'docker'
   image: docker://rdaniels6813/semantic-release-alpine
-  args:
-    - semantic-release
+  pre-entrypoint: 'setup.sh'
+  entrypoint: 'main.sh'
   env:
     GITHUB_TOKEN: ${{ inputs.github-token }}
+    PLUGINS: ${{ inputs.plugins }}

main.sh

@@ -0,0 +1,2 @@
+#! /bin/sh
+semantic-release

setup.sh

@@ -0,0 +1,13 @@
+#! /bin/sh
+if [ ".npmrc" ]; then
+  cp .npmrc ~/
+fi
+if [ "$PLUGINS" != "" ]; then
+  npm install --ignore-scripts -g $PLUGINS
+fi
+if [ "~/.npmrc" ]; then
+  rm ~/.npmrc
+fi
+if [ "$PLUGINS" != "" ]; then
+  npm rebuild -g $PLUGINS
+fi