ci: verify that the action.yml files are in sync

.github/workflows/checkin.yml

@@ -13,6 +13,14 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: 20
+      - name: Verify that action.yml files are in sync
+        run: |
+          npm run update-detached-action.yml &&
+          if ! git diff --exit-code \*action.yml
+          then
+            echo '::error::action.yml files are not in sync, maybe run `npm run update-detached-action.yml`?'
+            exit 1
+          fi
       - name: Install dependencies
         run: npm ci
       - name: Run tests
@@ -24,7 +32,8 @@ jobs:
       - name: Verify that the project is built
         run: |
           if [[ -n $(git status -s) ]]; then
-            echo "ERROR: generated dist/ differs from the current sources"
+            echo "ERROR: generated lib/ differs from the current sources"
+            git status -s
             git diff
             exit 1
           fi

detached/action.yml

@@ -64,4 +64,3 @@ outputs:
     description: 'The raw SSH address without the "ssh" prefix (only set when detached mode is enabled)'
   web-url:
     description: 'The web URL to connect to the tmate session (only set when detached mode is enabled and web URL is available)'
-

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "node src/index.js",
     "build": "ncc build src/main.js -o lib",
+    "update-detached-action.yml": "sed '/^runs:$/{N;N;N;s/lib\\//..\\/&/g;};/^  detached:/{N;N;N;s/\\(default: .\\)false/\\1true/g;}' action.yml >detached/action.yml",
     "test": "GITHUB_EVENT_PATH= jest"
   },
   "repository": {