Setup yamllint

* config
* make target
* github action

Signed-off-by: Yury Tsarev <yury@upbound.io>

.github/workflows/yamllint.yaml

@@ -0,0 +1,14 @@
+name: yamllint
+on: [pull_request]
+jobs:
+  yamllint:
+    name: runner / yamllint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: yamllint
+        uses: reviewdog/action-yamllint@v1.9.0
+        with:
+          reporter: github-pr-review
+          yamllint_flags: 'apis'
+          fail_on_error: true

.yamllint

@@ -0,0 +1,5 @@
+extends: default
+
+rules:
+  line-length: disable
+  document-start: disable

Makefile

@@ -75,4 +75,9 @@ e2e: build controlplane.up local.xpkg.deploy.configuration.$(PROJECT_NAME) uptes
 render:
 	crossplane beta render examples/network-xr.yaml apis/basic/composition.yaml examples/function/function.yaml -r
 
-.PHONY: uptest e2e render
+yamllint:
+	@$(INFO) running yamllint
+	@yamllint ./apis || $(FAIL)
+	@$(OK) running yamllint
+
+.PHONY: uptest e2e render yamllint