Add release flow to github actions

.github/workflows/release-reproducible-smart-contract.yaml

@@ -0,0 +1,60 @@
+on:
+    push:
+      branches:
+        - ekw/SRE-1010/migrate-release-flow-gha
+      tags:
+        - verifiable-sc/*
+
+  env:
+    SERVICE_NAME: 'verifiable-sc'
+    SOURCE_IMAGE_TAG: 'rust:1.75.0'
+
+  jobs:
+    release-docker:
+      runs-on: ubuntu-latest
+      environment: release
+      steps:
+        - name: Login to Docker Hub
+          if: ${{ secrets.DOCKERHUB_TOKEN }}
+          uses: docker/login-action@v3
+          with:
+              username: 'concordium'
+              password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+        - name: Clone repo
+          uses: actions/checkout@v4
+          with:
+              ref: ${{ github.ref_name }}
+              submodules: recursive
+
+        - name: Set image tag if correctly formatted
+          env:
+              TAG: ${{ github.ref_name }}
+          run: |
+              SERVICE_TAG=${TAG##${{ env.SERVICE_NAME }}/}
+              IFS='-' read -r ENVIRONMENT TAG_VERSION <<< "$SERVICE_TAG"
+              echo "FULL_IMAGE_TAG=concordium/${{ env.SERVICE_NAME }}-${TAG_VERSION}" >> $GITHUB_ENV
+              echo "ENVIRONMENT=$ENVIRONMENT" >> $GITHUB_ENV
+  
+        - name: Check if image exist
+          run: |
+              set +e
+              docker manifest inspect ${{ env.FULL_IMAGE_TAG }}
+              EXITCODE=$?
+              if [ $EXITCODE -eq "0" ]; then
+                echo "Error: ${{ env.FULL_IMAGE_TAG }} already exist"
+                exit 1
+              fi
+  
+        - name: Build and push docker image
+          if: ${{ secrets.DOCKERHUB_TOKEN }}
+          uses: docker/build-push-action@v6
+          with:
+            context: ./reproducible
+            file: ./reproducible/build.Dockerfile
+            tags: ${{ env.FULL_IMAGE_TAG }}
+            no-cache: true
+            push: false
+            build-args: |
+                source_image=${{ env.SOURCE_IMAGE_TAG }}
+