Added workflow that builds and pushes feed-discorvery to ghcr

.github/workflows/deploy-feed-discovery-image.yaml

@@ -0,0 +1,29 @@
+name: Build and push feed-discovery service to ghcr
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'src/api/feed-discovery/**'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: src/api/feed-discovery
+          push: true
+          tags: feed-discovery:latest