Add integration test workflow for Helm chart

Signed-off-by: Yi Chen <[email protected]>

Author: ChenYi015

.github/workflows/test-helm.yaml

@@ -0,0 +1,74 @@
+name: Unit and Integration Test - Helm
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test-helm-chart:
+    name: Test Helm Chart
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Determine branch name
+        id: get_branch
+        run: |
+          BRANCH=""
+          if [ "${{ github.event_name }}" == "push" ]; then
+            BRANCH=${{ github.ref_name }}
+          elif [ "${{ github.event_name }}" == "pull_request" ]; then
+            BRANCH=${{ github.base_ref }}
+          fi
+          echo "Branch name: $BRANCH"
+          echo "BRANCH=$BRANCH" >> "$GITHUB_OUTPUT"
+
+      - name: Checkout Code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up chart-testing
+        uses: helm/[email protected]
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        env:
+          BRANCH: ${{ steps.get_branch.outputs.BRANCH }}
+        run: |
+          changed=$(ct list-changed --target-branch $BRANCH)
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Run chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        env:
+          BRANCH: ${{ steps.get_branch.outputs.BRANCH }}
+        run: |
+          ct lint --check-version-increment=false --target-branch $BRANCH
+
+      - name: Run Helm unittest
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          make helm-unittest
+
+      - name: Produce the Helm documentation
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          make helm-docs
+          if ! git diff --quiet -- charts/kubeflow-trainer/README.md; then
+            echo "Need to re-run 'make helm-docs' and commit the changes."
+            false
+          fi
+
+      - name: Create kind cluster
+        if: steps.list-changed.outputs.changed == 'true'
+        uses: helm/[email protected]
+
+      - name: Run chart-testing (install)
+        if: steps.list-changed.outputs.changed == 'true'
+        env:
+          BRANCH: ${{ steps.get_branch.outputs.BRANCH }}
+        run: |
+          ct install --target-branch $BRANCH