chore(ci): add mocks check step

Dockerfile

@@ -3,16 +3,20 @@ ARG ALPINE_VERSION=3.18
 ARG GO_VERSION=1.20
 ARG XCPUTRANSLATE_VERSION=v0.6.0
 ARG GOLANGCI_LINT_VERSION=v1.52.2
+ARG MOCKGEN_VERSION=v1.6.0
 
 FROM --platform=${BUILDPLATFORM} qmcgaw/xcputranslate:${XCPUTRANSLATE_VERSION} AS xcputranslate
 FROM --platform=${BUILDPLATFORM} qmcgaw/binpot:golangci-lint-${GOLANGCI_LINT_VERSION} AS golangci-lint
+FROM --platform=${BUILDPLATFORM} qmcgaw/binpot:mockgen-${MOCKGEN_VERSION} AS mockgen
 
 FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base
 WORKDIR /tmp/gobuild
 ENV CGO_ENABLED=0
-RUN apk --update add git g++
+# Note: findutils needed to have xargs support `-d` flag for mocks stage.
+RUN apk --update add git g++ findutils
 COPY --from=xcputranslate /xcputranslate /usr/local/bin/xcputranslate
 COPY --from=golangci-lint /bin /go/bin/golangci-lint
+COPY --from=mockgen /bin /go/bin/mockgen
 # Copy repository code and install Go dependencies
 COPY go.mod go.sum ./
 RUN go mod download
@@ -31,6 +35,18 @@ FROM --platform=$BUILDPLATFORM base AS lint
 COPY .golangci.yml ./
 RUN golangci-lint run --timeout=10m
 
+FROM --platform=${BUILDPLATFORM} base AS mocks
+RUN git init && \
+    git config user.email ci@localhost && \
+    git config user.name ci && \
+    git config core.fileMode false && \
+    git add -A && \
+    git commit -m "snapshot" && \
+    grep -lr -E '^// Code generated by MockGen\. DO NOT EDIT\.$' . | xargs -r -d '\n' rm && \
+    go generate -run "mockgen" ./... && \
+    git diff --exit-code && \
+    rm -rf .git/
+
 FROM --platform=$BUILDPLATFORM base AS build
 ARG VERSION=unknown
 ARG BUILD_DATE="an unknown date"