ci: migrate yamllint to GitHub Actions

- Container image used in yaml-lint task is outdated and using it causes rate-limiting issues with docker.io
- Remove the task and create a GitHub Action that installs yamllint and then runs it

.github/workflows/yaml-lint.yaml

@@ -0,0 +1,15 @@
+---
+name: yamllint
+on:
+  pull_request:
+    branches: [main]
+jobs:
+  yamllint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install yamllint
+        run: pip install yamllint
+      - name: Lint YAML files
+        run: yamllint .

.tekton/pull-request.yaml

@@ -5,8 +5,7 @@ metadata:
   name: build-definitions-pull-request
   annotations:
     pipelinesascode.tekton.dev/on-cel-expression: (event == "pull_request" && target_branch == "main" && ( !has(body.pull_request) || !body.pull_request.draft) ) || (event == "push" && target_branch.startsWith("gh-readonly-queue/main/"))
-    pipelinesascode.tekton.dev/task: "[task/git-clone/0.1/git-clone.yaml, .tekton/tasks/buildah.yaml, .tekton/tasks/yaml-lint.yaml, .tekton/tasks/e2e-test.yaml, task/sast-snyk-check/0.2/sast-snyk-check.yaml]"
-    pipelinesascode.tekton.dev/task-2: "yaml-lint"
+    pipelinesascode.tekton.dev/task: "[task/git-clone/0.1/git-clone.yaml, .tekton/tasks/buildah.yaml, .tekton/tasks/e2e-test.yaml, task/sast-snyk-check/0.2/sast-snyk-check.yaml]"
     pipelinesascode.tekton.dev/max-keep-runs: "5"
 spec:
   params:
@@ -37,17 +36,6 @@ spec:
             value: $(params.revision)
           - name: depth
             value: "0"
-      - name: yaml-lint-check
-        runAfter:
-          - fetch-repository
-        taskRef:
-          name: yaml-lint
-        workspaces:
-          - name: shared-workspace
-            workspace: workspace
-        params:
-        - name: args
-          value: [".", "-c", "/workspace/shared-workspace/source/.yamllint"]
       - name: sast-snyk-check
         runAfter:
           - fetch-repository
@@ -57,8 +45,6 @@ spec:
           - name: workspace
             workspace: workspace
       - name: build-container
-        runAfter:
-          - yaml-lint-check
         params:
           - name: IMAGE
             value: quay.io/konflux-ci/pull-request-builds:appstudio-utils-{{revision}}

partners/README.md

@@ -20,7 +20,6 @@ Send a pull request to the [build-definitions](https://github.com/konflux-ci/bui
 ### How to debug the CI failures in my submitted Task?
 
 Check the logs of the `check-partner-tasks` Task in the `build-definitions-pull-request` PR check.
-If you see the Task `yaml-lint-check` has failed, then your Task YAML contains yaml-lint errors.
 
 ### Checks