ci: add protolint validation

Signed-off-by: Justin Chadwell <[email protected]>

Author: jedevc

docker-bake.hcl

@@ -93,6 +93,7 @@ target "lint" {
       { name = "labs", tags = "dfrunsecurity", target = "golangci-lint" },
       { name = "nydus", tags = "nydus", target = "golangci-lint" },
       { name = "yaml", tags = "", target = "yamllint" },
+      { name = "proto", tags = "", target = "protolint" },
     ]
   }
 }

hack/dockerfiles/lint.Dockerfile

@@ -1,11 +1,18 @@
 # syntax=docker/dockerfile-upstream:master
 
 ARG GO_VERSION=1.20
+ARG PROTOLINT_VERSION=0.45.0
+ARG GOLANGCI_LINT_VERSION=1.52.2
 
-FROM golang:${GO_VERSION}-alpine AS base
+FROM golang:${GO_VERSION}-alpine AS golang-base
+FROM yoheimuta/protolint:${PROTOLINT_VERSION} AS protolint-base
+
+FROM golang-base AS base
 ENV GOFLAGS="-buildvcs=false"
+ARG GOLANGCI_LINT_VERSION
 RUN apk add --no-cache gcc musl-dev yamllint
-RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.52.2
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v${GOLANGCI_LINT_VERSION}
+COPY --link --from=protolint-base /usr/local/bin/protolint /usr/local/bin/protolint
 WORKDIR /go/src/github.com/moby/buildkit
 
 FROM base as golangci-lint
@@ -20,6 +27,12 @@ RUN --mount=target=/go/src/github.com/moby/buildkit --mount=target=/root/.cache,
   yamllint -c .yamllint.yml --strict . && \
   touch /yamllint.done
 
+FROM base as protolint
+RUN --mount=target=/go/src/github.com/moby/buildkit \
+  protolint lint . && \
+  touch /protolint.done
+
 FROM scratch
 COPY --link --from=golangci-lint /golangci-lint.done /
 COPY --link --from=yamllint /yamllint.done /
+COPY --link --from=protolint /protolint.done /