add docker container repo push

.gitea/workflows/publish-docker.yaml

@@ -0,0 +1,19 @@
+name: Build and Publish drop-in-url-previews
+run-name: Build and Publish drop-in-url-previews
+on: [push]
+
+jobs:
+  build_and_publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Build Docker image
+        run: |
+          docker build -t git.i-am.nexus/nex/drop-in-url-previews:latest .
+      - name: Log into container registry
+        run: |
+          docker login -u ${{ secrets.CR_USERNAME }} -p ${{ secrets.CR_PASSWORD }} git.i-am.nexus
+      - name: Push to container registry
+        run: |
+          docker push git.i-am.nexus/nex/drop-in-url-previews:latest