github: run linter and mod-check in CI

Author: guggero

.github/workflows/main.yml

@@ -171,12 +171,37 @@ jobs:
         working-directory: ./app
         run: yarn
 
-      - name: run check
-        run: make protos-check
+      - name: setup go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: '${{ env.GO_VERSION }}'
 
       - name: compile rpc for golang
         run: make rpc
 
+      - name: run check
+        run: make mod-check
+
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: setup go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: '${{ env.GO_VERSION }}'
+
+      - name: prepare dummy static data
+        run: mkdir -p app/build; touch app/build/index.html
+
+      - name: run check
+        run: make lint mod-check
+
   unit-race:
     name: unit-race
     runs-on: ubuntu-latest