feat: add .github/actions/github

Author: galargh

.github/actions/github/action.yml

@@ -0,0 +1,31 @@
+name: 'Docker Container Action'
+description: 'A reimplementation of docker container action'
+inputs:
+  github:
+    description: 'The GitHub context'
+    required: true
+    default: ${{ toJSON(github) }}
+outputs:
+  action_repository:
+    description: 'The GitHub action repository name'
+    value: ${{ steps.action.outputs.action_repository }}
+  action_ref:
+    description: 'The GitHub action repository ref'
+    value: ${{ steps.action.outputs.action_ref }}
+runs:
+  using: 'composite'
+  steps:
+    - id: action
+      env:
+        ACTION_PATH: ${{ fromJSON(inputs.github).action_path }}
+        REPOSITORY: ${{ fromJSON(inputs.github).repository }}
+        SHA: ${{ fromJSON(inputs.github).sha }}
+      run: |
+        if [[ $ACTION_PATH == */_actions/* ]]; then
+          echo "action_repository=$(echo ${ACTION_PATH#*/_actions/} | cut -d/ -f1-2)" >> $GITHUB_OUTPUT
+          echo "action_ref=$(echo ${ACTION_PATH#*/_actions/} | cut -d/ -f3)" >> $GITHUB_OUTPUT
+        else
+          echo "action_repository=$GITHUB_REPOSITORY" >> $GITHUB_OUTPUT
+          echo "action_ref=$GITHUB_SHA" >> $GITHUB_OUTPUT
+        fi
+      shell: bash

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [1.1.3] - 2023-03-10
+### Added
+- Added `.github/actions/github` composite action to infer GitHub action repository and ref from GitHub action path
+
 ## [1.1.2] - 2023-03-10
 ### Changed
 - Do not pass internal inputs to the docker run step

README.md

@@ -42,22 +42,14 @@ When the Docker Container Action runs, it first checks if the specified image ex
 This action is commonly used inside a composite action. For example, if the composite action is defined in the `github/example` repository, you could use the Docker Container Action in a step with the following syntax:
 
 ```yml
-# This step is required because GitHub Actions doesn't set GITHUB_ACTION_REPOSITORY nor GITHUB_ACTION_REF properly :(
-- id: action
-  run: |
-    if [[ $GITHUB_ACTION_PATH == */_actions/* ]]; then
-      echo "repository=$(echo ${GITHUB_ACTION_PATH#*/_actions/} | cut -d/ -f1-2)" >> $GITHUB_OUTPUT
-      echo "ref=$(echo ${GITHUB_ACTION_PATH#*/_actions/} | cut -d/ -f3)" >> $GITHUB_OUTPUT
-    else
-      echo "repository=$GITHUB_REPOSITORY" >> $GITHUB_OUTPUT
-      echo "ref=$GITHUB_SHA" >> $GITHUB_OUTPUT
-    fi
-  shell: bash
+- id: github
+  name: Infer GitHub action repository and ref from GitHub action path
+  uses: pl-strflt/docker-container-action/.github/actions/github@v1
 - name: Run Docker container
   uses: pl-strflt/docker-container-action@v1
   with:
-    repository: ${{ env.GITHUB_ACTION_REPOSITORY }}
-    ref: ${{ env.GITHUB_ACTION_REF }}
+    repository: ${{ steps.github.outputs.action_repository }}
+    ref: ${{ steps.github.outputs.action_ref }}
     opts: --network=host
 ```