Add gh action to build pr images.

Signed-off-by: Humair Khan <[email protected]>

Author: HumairAK

.github/workflows/build-prs.yml

@@ -0,0 +1,93 @@
+name: Build images for PRs
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - closed
+      - synchronize
+permissions:
+  pull-requests: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+env:
+  IMAGE_REPO_DSPO: data-science-pipelines-operator
+  SOURCE_BRANCH: ${{ github.event.pull_request.head.sha }}
+  QUAY_ORG: opendatahub
+  QUAY_ID: ${{ secrets.QUAY_ID }}
+  QUAY_TOKEN: ${{ secrets.QUAY_TOKEN }}
+  TARGET_IMAGE_TAG: pr-${{ github.event.pull_request.number }}
+jobs:
+  build-pr-image:
+    if: github.event.pull_request.state == 'open'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/build
+        with:
+          OVERWRITE: true
+          IMAGE_REPO: ${{ env.IMAGE_REPO_DSPO }}
+          DOCKERFILE: Dockerfile
+          GH_REPO: ${{ github.repository }}
+      - name: Post build
+        shell: bash
+        env:
+          GH_TOKEN: ${{ secrets.ACCESS_TOKEN }}
+          IMG: quay.io/${{ env.QUAY_ORG }}/data-science-pipelines-operator:${{ env.TARGET_IMAGE_TAG }}
+        run: |
+          git config user.email "[email protected]"
+          git config user.name "dsp-developers"
+          
+          action=${{ github.event.action }}
+          
+          if [[ "$action" == "synchronize" ]]; then 
+            echo "Change to PR detected. A new PR build was completed." >> /tmp/body-file.txt
+          fi
+          
+          if [[ "$action" == "reopened" ]]; then 
+            echo "PR was re-opened." >> /tmp/body-file.txt
+          fi
+          
+          cat <<"EOF" >> /tmp/body-file.txt
+            A new image has been built to help with testing out this PR: `${{ env.IMG }}`
+          EOF
+          
+          if [[ "$action" == "opened" || "$action" == "reopened" ]]; then 
+          cat <<"EOF" >> /tmp/body-file.txt
+          An OCP cluster where you are logged in as cluster admin is required. 
+          
+          To use this image run the following:
+          
+          ```bash
+          cd $(mktemp -d)
+          git clone [email protected]:opendatahub-io/data-science-pipelines-operator.git
+          cd data-science-pipelines-operator/
+          git fetch origin pull/${{ github.event.pull_request.number }}/head
+          git checkout -b pullrequest ${{ env.SOURCE_BRANCH }}
+          make deploy IMG="${{ env.IMG }}"
+          ```
+          
+          More instructions [here](https://github.com/opendatahub-io/data-science-pipelines-operator#deploy-dsp-instance) on how to deploy and test a Data Science Pipelines Application.
+              
+          EOF
+          fi
+
+          gh pr comment ${{ github.event.pull_request.number }} --body-file /tmp/body-file.txt
+
+  clean-pr-images:
+    if: github.event.pull_request.state == 'closed'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete PR image
+        shell: bash
+        run: |
+          tag=$(curl --request GET 'https://quay.io/api/v1/repository/${{ env.QUAY_ORG }}/${{ env.IMAGE_REPO_DSPO }}/tag/?specificTag=${{ env.TARGET_IMAGE_TAG }}')
+          exists=$(echo ${tag} | yq .tags - | yq any)
+          IMAGE=quay.io/${{ env.QUAY_ORG }}/${{ env.IMAGE_REPO_DSPO }}:${{ env.TARGET_IMAGE_TAG }}
+          if [[ "$exists" == "true" ]]; then
+            echo "PR Closed deleting image...${{ env.IMAGE }}."
+            skopeo delete --creds ${{ env.QUAY_ID }}:${{ env.QUAY_TOKEN }} docker://${IMAGE}
+          else
+            echo "Deletion of image ${IMAGE} skipped because image already does not exist."
+          fi