Drone: Check CUE dashboard schemas (#29334)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

scripts/lib.star

@@ -1,5 +1,5 @@
 grabpl_version = '0.5.28'
-build_image = 'grafana/build-container:1.2.29'
+build_image = 'grafana/build-container:1.2.30'
 publish_image = 'grafana/grafana-ci-deploy:1.2.7'
 grafana_docker_image = 'grafana/drone-grafana-docker:0.3.2'
 alpine_image = 'alpine:3.12'
@@ -510,22 +510,23 @@ def shellcheck_step():
         'depends_on': [
             'initialize',
         ],
-        'environment': {
-            'VERSION': '0.7.1',
-            'CHKSUM': 'beca3d7819a6bdcfbd044576df4fc284053b48f468b2f03428fe66f4ceb2c05d9b5411357fa15003cb0' +
-                '311406c255084cf7283a3b8fce644c340c2f6aa910b9f',
-        },
         'commands': [
-            'curl -fLO http://storage.googleapis.com/grafana-downloads/ci-dependencies/shellcheck-' +
-                'v$${VERSION}.linux.x86_64.tar.xz',
-            'echo $$CHKSUM shellcheck-v$${VERSION}.linux.x86_64.tar.xz | sha512sum --check --strict --status',
-            'tar xf shellcheck-v$${VERSION}.linux.x86_64.tar.xz',
-            'mv shellcheck-v$${VERSION}/shellcheck /usr/local/bin/',
-            'rm -rf shellcheck-v$${VERSION}*',
             './bin/grabpl shellcheck',
         ],
     }
 
+def dashboard_schemas_check():
+    return {
+        'name': 'check-dashboard-schemas',
+        'image': build_image,
+        'depends_on': [
+            'initialize',
+        ],
+        'commands': [
+            'cue export --out openapi -o - ./dashboard-schemas/...',
+        ],
+    }
+
 def package_step(edition, ver_mode, variants=None, is_downstream=False):
     if variants:
         variants_str = ' --variants {}'.format(','.join(variants))
@@ -592,6 +593,7 @@ def package_step(edition, ver_mode, variants=None, is_downstream=False):
             'test-frontend',
             'codespell',
             'shellcheck',
+            'check-dashboard-schemas',
         ],
         'environment': env,
         'commands': cmds,