Add tests for Action syntax

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Action CI
+
+on: [push]
+
+jobs:
+
+  build:
+ 
+    runs-on: ubuntu-latest
+ 
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build Docker image
+      run: docker build . --tag my-image-name:$(date +%s)
+    - name: Verify action syntax 
+      # The action should not publish any real changes, but should succeed.
+      uses: './'
+      with:
+        github_token: '${{ secrets.GITHUB_TOKEN }}'
+        branch: '${{ github.ref }}'

.github/workflows/dockerimage.yml

@@ -1,14 +0,0 @@
-name: Docker Image CI
-
-on: [push]
-
-jobs:
-
-  build:
- 
-    runs-on: ubuntu-latest
- 
-    steps:
-    - uses: actions/checkout@v1
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag my-image-name:$(date +%s)