Allow the use of Github OAuth tokens for composer install

Author: baschny

README.md

@@ -16,6 +16,9 @@ Input
 
 * `args`: Other command line arguments to pass to composer, defaults to `--optimize-autoloader --no-progress`
 
+* `github_oauth`: If your composer needs access to a private repo, configure the github OAuth token to use here.
+   For example it could come from a secret, i.e. `secrets.GITHUB_OAUTH`.
+
 Output
 ------
 * `composer_cache_dir`: where the composer cache is located, in case you want to use `actions/cache`
@@ -63,6 +66,7 @@ jobs:
         with:
           composer_version: ${{ env.COMPOSER_VERSION }}
           command: install
+          #github_oauth: ${{ secret.GITHUB_OAUTH }}
 ```
 
 License

action.yml

@@ -17,6 +17,11 @@ inputs:
     required: false
     default: "--optimize-autoloader --no-progress"
 
+  github_oauth:
+    description: "OAuth token for accessing github private resources"
+    required: false
+    default: ""
+
 outputs:
   composer_cache_dir:
     description: "Where composer created its cache"
@@ -37,6 +42,7 @@ runs:
         COMPOSER_VERSION: ${{ inputs.composer_version }}
         COMPOSER_COMMAND: ${{ inputs.command }}
         COMPOSER_ARGS: ${{ inputs.args }}
+        GITHUB_OAUTH: ${{ inputs.github_oauth }}
       shell: bash
       id: composer_run
       run: |
@@ -52,6 +58,11 @@ runs:
         echo "::set-output name=composer_major_version::${DETECTED_MAJOR_VERSION}"
         echo "::set-output name=composer_version::${DETECTED_VERSION}"
 
+        if [ "$GITHUB_OAUTH" ]; then
+          docker run --rm --volume ${RUNNER_WORKSPACE}/composer:/tmp \
+            composer:${COMPOSER_VERSION} config -g github-oauth.github.com $GITHUB_OAUTH
+        fi
+
         case "${COMPOSER_COMMAND}" in
           get_config)
             exit