Added Docker Hub upload workflow

.github/workflows/docker_hub.yml

@@ -0,0 +1,38 @@
+name: Docker Hub upload
+
+on:
+  push:
+    tags-ignore:
+      - "v1"
+      - "v2"
+      - "v3"
+      - "v4"
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v2
+
+    - name: Log in to Docker Hub
+      uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+      with:
+        images: setsoft/kicad_auto
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+      with:
+        # context: tools/dev_image
+        push: true
+        tags: setsoft/kicad_auto:latest
+        labels: ${{ steps.meta.outputs.labels }}