Re-enable docker image builds

This commit re-enables docker image builds which was moved to a different CI server in a previous commit.

Signed-off-by: Sayan Nandan <nandansayan@outlook.com>

.github/workflows/docker-image.yml

@@ -0,0 +1,39 @@
+name: Docker image
+
+on:
+  push:
+    # Publish `next` as Docker `latest` image.
+    branches:
+      - next
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+env:
+  IMAGE_NAME: tdb
+  BUILD: "false"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 2
+      - name: Setup environment
+        run: |
+          chmod +x ci/buildvars.sh
+          ci/buildvars.sh
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME
+        if: env.BUILD == 'true' || github.event_name == 'create' && startsWith(github.ref, 'refs/tags/v')
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: terrabasedb/tdb
+          tags: latest
+          tag_with_ref: true
+        if: env.BUILD == 'true' || github.event_name == 'create' && startsWith(github.ref, 'refs/tags/v')