add automatic build of devcontainer if it changes

.gitea/workflows/build-container.yaml

@@ -0,0 +1,26 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log into Gitea Container Registry
+        run: |
+          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login git.silklaasboer.nl -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Build Docker image
+        run: |
+          docker build -t git.silklaasboer.nl/${{ secrets.DOCKER_USERNAME }}/devcontainer:latest .
+
+      - name: Push Docker image
+        run: |
+          docker push git.silklaasboer.nl/${{ secrets.DOCKER_USERNAME }}/devcontainer:latest