add Containerfile.plugin and update tekton config for docker file for down stream build

Signed-off-by: Mangaal <[email protected]>

Author: Mangaal

.konflux/gitops-backend/Containerfile.plugin

@@ -0,0 +1,31 @@
+# Build Stage
+FROM  brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_8_golang_1.22 AS builder
+WORKDIR /go/src
+COPY . /go/src
+RUN GIT_COMMIT=$(git rev-parse HEAD) && \
+  CGO_ENABLED=0 GOOS=linux go build -a -mod=readonly \
+  -ldflags "-X github.com/redhat-developer/gitops-backend/pkg/health.GitRevision=${GIT_COMMIT}" ./cmd/backend-http
+
+# Final Stage
+FROM registry.access.redhat.com/ubi8/ubi-minimal
+WORKDIR /
+COPY --from=builder /go/src/backend-http .
+EXPOSE 8080
+ENTRYPOINT ["./backend-http"]
+
+LABEL \
+    name="openshift-gitops-1/gitops-rhel8" \
+    version=${CI_CONTAINER_VERSION} \
+    License="Apache 2.0" \
+    com.redhat.component="openshift-gitops-container" \
+    com.redhat.delivery.appregistry="false" \
+    release=${CI_CONTAINER_RELEASE} \
+    upstream-version=${CI_UPSTREAM_VERSION} \
+    upstream-vcs-ref="${CI_GITOPS_BACKEND_UPSTREAM_COMMIT}" \
+    upstream-vcs-type="git" \
+    summary="Red Hat OpenShift GitOps Backend Service" \
+    io.openshift.expose-services="" \
+    io.openshift.tags="openshift,gitops" \
+    io.k8s.display-name="Red Hat OpenShift GitOps Backend Service" \
+    maintainer="William Tam <[email protected]>" \
+    description="Red Hat OpenShift GitOps Backend Service"

.tekton/gitops-backend-pull-request.yaml

@@ -27,7 +27,7 @@ spec:
   - name: image-expires-after
     value: 5d
   - name: dockerfile
-    value: Dockerfile
+    value: .konflux/gitops-backend/Containerfile.plugin
   pipelineSpec:
     description: |
       This pipeline is ideal for building multi-arch container images from a Containerfile while maintaining trust after pipeline customization.

.tekton/gitops-backend-push.yaml

@@ -24,7 +24,7 @@ spec:
   - name: output-image
     value: quay.io/redhat-user-workloads/rh-openshift-gitops-tenant/openshift-gitops-operator/gitops-backend:{{revision}}
   - name: dockerfile
-    value: Dockerfile
+    value: .konflux/gitops-backend/Containerfile.plugin
   pipelineSpec:
     description: |
       This pipeline is ideal for building multi-arch container images from a Containerfile while maintaining trust after pipeline customization.