Merge pull request #9 from arnarg/update-action

Update github action to support PRs

Author: arnarg

action.yml

@@ -8,6 +8,12 @@ inputs:
   cwd:
     description: Path to directory containing the checked out repository
     default: '.'
+  pr:
+    description: Whether or not to make a PR for the promotion
+    default: 'false'
+  token:
+    description: 'GITHUB_TOKEN or a `repo` scoped Personal Access Token (PAT)'
+    default: ${{github.token}}
 
 runs:
   using: composite
@@ -18,6 +24,7 @@ runs:
         DEST_DIR: ${{runner.temp}}/${{inputs.environment}}
       run: |
         TARGET_BRANCH=$(nix run '${{env.FLAKE}}#' -- info '${{inputs.cwd}}#${{inputs.environment}}' --json | jq -r .branch)
+        PR_BRANCH="promote/$TARGET_BRANCH"
 
         if git -C "${{inputs.cwd}}" fetch origin "$TARGET_BRANCH"; then
           git -C "${{inputs.cwd}}" worktree add --checkout "${{env.DEST_DIR}}" "$TARGET_BRANCH"
@@ -29,13 +36,31 @@ runs:
 
         rsync --recursive --delete --exclude=.git -L "$RESULT/" "${{env.DEST_DIR}}"
 
-        echo "BRANCH=$TARGET_BRANCH" >> "$GITHUB_ENV"
+        if [[ "${{inputs.pr}}" == "true" ]]; then
+          git -C "${{env.DEST_DIR}}" checkout -B "$PR_BRANCH"
+          echo "BRANCH=$PR_BRANCH" >> "$GITHUB_ENV"
+          echo "FORCE=--force" >> "$GITHUB_ENV"
+        else
+          echo "BRANCH=$TARGET_BRANCH" >> "$GITHUB_ENV"
+          echo "FORCE=" >> "$GITHUB_ENV"
+        fi
+
+        echo "TARGET_BRANCH=$TARGET_BRANCH" >> "$GITHUB_ENV"
         echo "DEST_DIR=$(realpath --relative-to "$PWD" "$DEST_DIR")" >> "$GITHUB_ENV"
+        echo "COMMIT_MESSAGE=chore(${{inputs.environment}}): promote to ${{inputs.environment}} ${{github.sha}}" >> "$GITHUB_ENV"
 
     - uses: EndBug/add-and-commit@v9
       with:
         cwd: ${{env.DEST_DIR}}
         default_author: github_actions
-        message: "chore(${{inputs.environment}}): promote to ${{inputs.environment}} ${{github.sha}}"
+        message: ${{env.COMMIT_MESSAGE}}
         fetch: false
-        push: --set-upstream origin ${{env.BRANCH}}
+        push: --set-upstream origin ${{env.BRANCH}} ${{env.FORCE}}
+
+    - uses: thomaseizinger/create-pull-request@1.4.0
+      if: inputs.pr == 'true'
+      with:
+        github_token: ${{inputs.token}}
+        head: ${{env.BRANCH}}
+        base: ${{env.TARGET_BRANCH}}
+        title: ${{env.COMMIT_MESSAGE}}