ci cache modules

.github/workflows/go.yml

@@ -1,5 +1,17 @@
 name: Go
-on: [push]
+on:
+  push:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
+  pull_request:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
 jobs:
 
   test:
@@ -14,9 +26,10 @@ jobs:
       uses: actions/setup-go@v1
       with:
         go-version: ${{ matrix.go }}
+      id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Set GOPATH
       # temporary fix
@@ -26,6 +39,13 @@ jobs:
         echo "##[add-path]$(dirname $GITHUB_WORKSPACE)/bin"
       shell: bash
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Get dependencies
       run: | 
         go get -u -v golang.org/x/lint/golint