chore(ci): lint files in Agola

.agola/config.yml

@@ -0,0 +1,16 @@
+version: v0
+runs:
+  - name: Lint
+    tasks:
+      - name: Lint code
+        runtime:
+          containers:
+            - image: docker.io/bufbuild/buf:latest
+        steps:
+          - clone:
+          - run:
+              name: buf lint
+              command: |-
+                buf ls-files
+                buf lint
+              working_dir: ~/project/proto