Revert "TO REVERT: Deleting other tests."

This reverts commit a0c57b9c11.

.github/workflows/dockerfile.yml

@@ -0,0 +1,26 @@
+name: "Dockerfile"
+
+# any branch is useful for testing before a PR is submitted
+on: [push, pull_request]
+
+jobs:
+  dockerfile:
+    # run on pushes to any branch
+    # run on PRs from external forks
+    if: |
+         (github.event_name != 'pull_request')
+         || (github.event.pull_request.head.repo.id != github.event.pull_request.base.repo.id)
+    name: build image and run connectivity test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: docker build
+      run: |
+        docker build -t etherpad:test .
+        docker run -d -p 9001:9001 etherpad:test
+        ./src/bin/installDeps.sh
+        sleep 3 # delay for startup?
+        cd src && npm run test-container