fix: work around chart-testing not supporting lib charts

See helm/chart-testing#237.
Add an empty values file in the CI to library charts for the linter.
Exclude library charts for the installer.

.github/workflows/helm-charts.yaml

@@ -21,6 +21,8 @@ jobs:
       is_pull_request: ${{ github.event_name == 'pull_request' }}
       target_branch: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref || github.ref_name }}
       charts: ${{ steps.list-charts.outputs.charts }}
+      app_charts: ${{ steps.list-app-charts.outputs.charts }}
+      lib_charts: ${{ steps.list-lib-charts.outputs.charts }}
     timeout-minutes: 1
     steps:
       - name: Expose variables
@@ -31,7 +33,15 @@ jobs:
 
       - name: List charts
         id: list-charts
-        run: echo "charts=$(ls -dm charts/*/ | tr -d ' ')" >> $GITHUB_OUTPUT
+        run: echo "charts=$(./bin/list-charts)" >> $GITHUB_OUTPUT
+
+      - name: List application charts
+        id: list-app-charts
+        run: echo "charts=$(./bin/list-charts -a)" >> $GITHUB_OUTPUT
+
+      - name: List library charts
+        id: list-lib-charts
+        run: echo "charts=$(./bin/list-charts -l)" >> $GITHUB_OUTPUT
 
   lint-charts:
     name: Lint Charts
@@ -75,6 +85,16 @@ jobs:
             echo "changed=false" >> "$GITHUB_OUTPUT"
           fi
 
+      - name: Prepare library charts
+        if: ${{ steps.list-changed.outputs.changed == 'true' }}
+        run: |
+          lib_charts="${{ needs.vars.outputs.lib_charts }}"
+          for lc in "${lib_charts//,/ }" ; do
+              # Add values.yaml file so the linter doesn't complain
+              echo "${lc}/values.yaml"
+              touch "${lc}/values.yaml"
+          done
+
       - name: Lint charts
         if: ${{ steps.list-changed.outputs.changed == 'true' }}
         run: ct lint --config etc/ct.yaml ${{ needs.vars.outputs.is_pull_request == 'true' && format('--target-branch {0}', needs.vars.outputs.target_branch) || format('--charts {0}', needs.vars.outputs.charts) }}
@@ -127,7 +147,7 @@ jobs:
 
       - name: Test charts
         if: ${{ steps.list-changed.outputs.changed == 'true' }}
-        run: ct install --config etc/ct.yaml ${{ needs.vars.outputs.is_pull_request == 'true' && format('--target-branch {0}', needs.vars.outputs.target_branch) || format('--charts {0}', needs.vars.outputs.charts) }}
+        run: ct install --config etc/ct.yaml ${{ needs.vars.outputs.is_pull_request == 'true' && format('--target-branch {0} --excluded-charts {1}', needs.vars.outputs.target_branch, needs.vars.outputs.lib_charts) || format('--charts {0}', needs.vars.outputs.app_charts) }}
 
   release-charts:
     name: Release Charts

bin/list-charts

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+GIT_ROOT=$(cd "$(dirname "$0")/.." && pwd)
+
+function usage() {
+    echo "Usage:"
+    echo "list-charts"
+    echo "    -h                      Display usage."
+    echo "    -a                      List only application charts."
+    echo "    -l                      List only library charts."
+    exit 0
+}
+
+function error() {
+    echo "${1}" 1>&2
+    exit 1
+}
+
+list_application_charts=false
+list_library_charts=false
+
+while getopts ":hal" opt; do
+    case ${opt} in
+        h )
+            usage
+        ;;
+        a )
+            list_application_charts=true
+        ;;
+        l )
+            list_library_charts=true
+        ;;
+        \? )
+            error "Invalid Option: -${OPTARG}"
+        ;;
+    esac
+done
+shift $((OPTIND -1))
+
+if [[ "${list_application_charts}" == false && "${list_library_charts}" == false ]]; then
+    list_application_charts=true
+    list_library_charts=true
+fi
+
+if [[ "${list_application_charts}" == true && "${list_library_charts}" == true ]]; then
+    output=$(find "${GIT_ROOT}"/charts/ -type f -name 'Chart.yaml')
+elif [[ "${list_application_charts}" == true ]]; then
+    output=$(find "${GIT_ROOT}"/charts/ -type f -name 'Chart.yaml' -exec sh -c 'yq -e '\''.type == "application"'\'' ${0} >/dev/null 2>&1 && echo ${0}' {} \;)
+elif [[ "${list_library_charts}" == true ]]; then
+    output=$(find "${GIT_ROOT}"/charts/ -type f -name 'Chart.yaml' -exec sh -c 'yq -e '\''.type == "library"'\'' ${0} >/dev/null 2>&1 && echo ${0}' {} \;)
+fi
+
+echo "${output}" | sed -r 's|/[^/]+$||' | sort -u | sed -z 's/\n/,/g;s/,$/\n/'