CI: Make shellcheck a standalone pipeline (#55082)

* Make shellcheck standalone pipeline

* Run shellcheck on every .sh change

* Change base image

* Trigger on script changes

* Run shellcheck on PRs only

scripts/drone/events/pr.star

@@ -34,6 +34,11 @@ load(
     'trigger_docs_pr',
 )
 
+load(
+    'scripts/drone/pipelines/shellcheck.star',
+    'shellcheck_pipeline',
+)
+
 ver_mode = 'pr'
 trigger = {
     'event': [
@@ -56,7 +61,8 @@ def pr_pipelines(edition):
         test_backend(get_pr_trigger(include_paths=['pkg/**', 'packaging/**', '.drone.yml', 'conf/**', 'go.sum', 'go.mod', 'public/app/plugins/**/plugin.json', 'devenv/**']), ver_mode),
         build_e2e(trigger, ver_mode, edition),
         integration_tests(get_pr_trigger(include_paths=['pkg/**', 'packaging/**', '.drone.yml', 'conf/**', 'go.sum', 'go.mod', 'public/app/plugins/**/plugin.json']), ver_mode, edition),
-        docs_pipelines(edition, ver_mode, trigger_docs_pr())
+        docs_pipelines(edition, ver_mode, trigger_docs_pr()),
+        shellcheck_pipeline(),
     ]
 
 

scripts/drone/events/release.star

@@ -13,7 +13,6 @@ load(
     'lint_backend_step',
     'lint_frontend_step',
     'codespell_step',
-    'shellcheck_step',
     'test_backend_step',
     'test_backend_integration_step',
     'test_frontend_step',
@@ -170,8 +169,6 @@ def get_steps(edition, ver_mode):
     ]
 
     test_steps = []
-    if edition != 'enterprise':
-        test_steps.extend([shellcheck_step()])
 
     test_steps.extend([
         codespell_step(),

scripts/drone/pipelines/shellcheck.star

@@ -0,0 +1,48 @@
+load(
+    'scripts/drone/steps/lib.star',
+    'build_image',
+    'compile_build_cmd'
+)
+
+load(
+    'scripts/drone/utils/utils.star',
+    'pipeline',
+)
+
+trigger = {
+    'event': [
+        'pull_request',
+    ],
+    'paths': {
+        'exclude': [
+            '*.md',
+            'docs/**',
+            'latest.json',
+        ],
+        'include': [
+            'scripts/**/*.sh'
+        ],
+    },
+}
+
+def shellcheck_step():
+    return {
+        'name': 'shellcheck',
+        'image': build_image,
+        'depends_on': [
+            'compile-build-cmd',
+        ],
+        'commands': [
+            './bin/build shellcheck',
+        ],
+    }
+
+def shellcheck_pipeline():
+    steps = [
+        compile_build_cmd(),
+        shellcheck_step(),
+    ]
+    return pipeline(
+            name='pr-shellcheck', edition="oss", trigger=trigger, services=[], steps=steps,
+    )
+

scripts/drone/pipelines/test_backend.star

@@ -4,7 +4,6 @@ load(
     'download_grabpl_step',
     'wire_install_step',
     'codespell_step',
-    'shellcheck_step',
     'lint_backend_step',
     'lint_drone_step',
     'test_backend_step',
@@ -28,7 +27,6 @@ def test_backend(trigger, ver_mode):
     ]
     test_steps = [
         codespell_step(),
-        shellcheck_step(),
         lint_backend_step(edition="oss"),
         test_backend_step(edition="oss"),
         test_backend_integration_step(edition="oss"),

scripts/drone/steps/lib.star

@@ -630,20 +630,6 @@ def codespell_step():
     }
 
 
-def shellcheck_step():
-    return {
-        'name': 'shellcheck',
-        'image': build_image,
-        'depends_on': [
-            'grabpl',
-            'compile-build-cmd',
-        ],
-        'commands': [
-            './bin/build shellcheck',
-        ],
-    }
-
-
 def package_step(edition, ver_mode, include_enterprise2=False, variants=None):
     deps = [
         'build-plugins',