Add workflow to publish Docker image to Docker Hub

  * Workflow is triggered when a release is triggered

Author: maquchizi

.github/workflows/publish-docker-image.yaml

@@ -0,0 +1,47 @@
+name: Publish Docker Image
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@0c366fd6a839edf440554fa01a7085ccba70ac98
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051
+        with:
+          images: codeforafrica/pesacheck-ghost
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-name: index.docker.io/codeforafrica/pesacheck-ghost
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true