chore(SRVKP-8611): include io.openshift.build and upstream-vcs labels to build image

Include several 'io.openshift.build.*' labels on the build output, as
well as several labels with upstream commit info. Follows BuildConfig
conventions set by source-to-image.

See also: https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/builds_using_buildconfig/managing-build-output#builds-output-image-labels_managing-build-output

Author: aThorp96

.tekton/docker-build-ta.yaml

@@ -25,6 +25,10 @@ spec:
   - description: Source Repository URL
     name: git-url
     type: string
+  - default: ""
+    description: Upstream source Repository URL
+    name: upstream-git-url
+    type: string
   - default: ""
     description: Revision of the Source Repository
     name: revision
@@ -33,7 +37,7 @@ spec:
     name: output-image
     type: string
   - default: .
-    description: Path to the source code of an application's component from where
+    description: Path to the source code of an applications component from where
       to build image.
     name: path-context
     type: string
@@ -142,6 +146,35 @@ spec:
     workspaces:
     - name: basic-auth
       workspace: git-auth
+  - name: extract-upstream-info
+    taskSpec:
+      results:
+      - name: upstream-vcs-ref
+      steps:
+      - name: use-trusted-artifact
+        image: quay.io/redhat-appstudio/build-trusted-artifacts:latest@sha256:8391272c4e5011120e9e7fee2c1f339e9405366110bf239dadcbc21e953ce099
+        args:
+        - use
+        - $(tasks.clone-repository.results.SOURCE_ARTIFACT)=/var/workdir/source
+      - image: registry.access.redhat.com/ubi9/ubi
+        workingDir: /var/workdir/source
+        script: |
+          #!/usr/bin/env bash
+          echo -n $(cat head 2>/dev/null || echo -n "") | tee $(results.upstream-vcs-ref.path)
+      stepTemplate:
+        volumeMounts:
+        - mountPath: /var/workdir
+          name: workdir
+      volumes:
+      - name: workdir
+        emptyDir: {}
+    runAfter:
+    - clone-repository
+    when:
+    - input: $(tasks.init.results.build)
+      operator: in
+      values:
+      - "true"
   - name: prefetch-dependencies
     params:
     - name: input
@@ -209,8 +242,18 @@ spec:
       value: $(tasks.prefetch-dependencies.results.CACHI2_ARTIFACT)
     - name: IMAGE_APPEND_PLATFORM
       value: $(params.build-image-index)
+    - name: LABELS
+      # Labels to mimic several s2i openshift labels as well as include upstream info
+      # See also: https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/builds_using_buildconfig/managing-build-output#builds-output-image-labels_managing-build-output
+      value:
+      - "io.openshift.build.commit.id=$(tasks.clone-repository.results.commit)"
+      - "io.openshift.build.commit.url=$(params.git-url)/commit/$(tasks.clone-repository.results.commit)"
+      - "io.openshift.build.source-location=$(params.git-url)"
+      - "upstream-vcs-ref=$(tasks.extract-upstream-info.results.upstream-vcs-ref)"
+      - "upstream-vcs-location=$(params.upstream-git-url)"
     runAfter:
     - prefetch-dependencies
+    - extract-upstream-info
     taskRef:
       params:
       - name: name