re-enable chart testing only on changes

.github/workflows/pr-helm-chart-testing.yml

@@ -29,7 +29,7 @@ jobs:
         version: v3.14.4
 
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.11'
         cache: 'pip'
@@ -54,16 +54,20 @@ jobs:
           echo "changed=true" >> "$GITHUB_OUTPUT"
         fi
 
+    # lint all charts if any changes were detected
     - name: Run chart-testing (lint)
-#       if: steps.list-changed.outputs.changed == 'true'
-      run: ct lint --all --config ct.yaml --target-branch ${{ github.event.repository.default_branch }}
+      if: steps.list-changed.outputs.changed == 'true'
+      run: ct lint --config ct.yaml --all
+      # the following would lint only changed charts, but linting isn't expensive
+      # run: ct lint --config ct.yaml --target-branch ${{ github.event.repository.default_branch }}
 
     - name: Create kind cluster
-#       if: steps.list-changed.outputs.changed == 'true'
+      if: steps.list-changed.outputs.changed == 'true'
       uses: helm/kind-action@v1.10.0
 
     - name: Run chart-testing (install)
-#       if: steps.list-changed.outputs.changed == 'true'
+      if: steps.list-changed.outputs.changed == 'true'
       run: ct install --all --helm-extra-set-args="--set=nginx.enabled=false" --debug --config ct.yaml
-#       run: ct install --target-branch ${{ github.event.repository.default_branch }}
-
+      # the following would install only changed charts, but we only have one chart so 
+      # don't worry about that for now
+      # run: ct install --target-branch ${{ github.event.repository.default_branch }}