ci: proper schema attempt

.github/workflows/test.yml

@@ -1,35 +1,52 @@
-on: [push, pull_request]
 name: Checks
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types:
+      - synchronize
 jobs:
-  test:
+  setup:
+    name: Setup
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Parse Go mod file
+        id: go_mod_parse
+        run: echo "::set-output name=go_mod_version::$(go mod edit -json | jq --raw-output .Go)"
+      - name: Setup specific Go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ steps.go_mod_parse.outputs.go_mod_version }}
+      - name: Restore cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: ${{ runner.os }}-go-
+  test:
+    name: Run tests
+    needs: setup
     runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-    - name: Restore cache
-      uses: actions/cache@v2
-      with:
-        path: |
-          ~/go/pkg/mod
-          ~/.cache/go-build
-          ~/Library/Caches/go-build
-          %LocalAppData%\go-build
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
-    - name: Checkout code
-      uses: actions/checkout@v2
-    - name: Fetch Go version from mod file
-      run: echo "GO_VERSION=$(grep "go 1." go.mod | cut -d " " -f 2)" >> $GITHUB_ENV
-    - name: Test
-      uses: actions/setup-go@v2
-      with:
-        go-version: ${{ env.GO_VERSION }}
-    - if: matrix.os == 'windows-latest'
-      run: go test -v -tags system .\...
-    - if: matrix.os != 'windows-latest'
-      # The CI has an old version of Go by default.
-      # setup-go installs the version we want, but
-      # root won't have that binary in its `secure_path`.
-      run: sudo $(which go) test -v -tags system ./...
+      - name: Windows
+        if: matrix.os == 'windows-latest'
+        run: go test -v -tags system .\...
+      - name: '*nix'
+        if: matrix.os != 'windows-latest'
+        # The CI has an old version of Go by default.
+        # setup-go installs the version we want, but
+        # root won't have that binary in its `secure_path`.
+        run: sudo $(which go) test -v -tags system ./...