Create build + push action.

.gitea/workflows/build_push.yaml

@@ -0,0 +1,28 @@
+name: Build and Push Docker Image
+run-name: Docker image is being constructed 🚀
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: https://github.com/actions/checkout@v3
+
+      - name: Log in to Gitea Docker Registry
+        uses: https://github.com/actions/docker/login-action@v1
+        with:
+          registry: gitea.maximilian.link
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: https://github.com/docker/build-push-action@v2
+        with:
+            context: .
+            push: true
+            tags: gitea.maximilian.link/maxi/isc:dev