Split up workflows and automatically pick latest Go version

.github/workflows/build.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.11.x, 1.12.x, 1.13.x, 1.14.x, 1.15.x]
+        go-version: [~1.13, ^1]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     env:
@@ -14,12 +14,12 @@ jobs:
       TERM: "xterm-256color"
     steps:
       - name: Install Go
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
 
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Download Go modules
         run: go mod download
@@ -30,12 +30,3 @@ jobs:
       - name: Test
         run: go test ./...
         if: matrix.os != 'windows-latest'
-
-      - name: Coverage
-        env:
-          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          go test -race -covermode atomic -coverprofile=profile.cov ./...
-          GO111MODULE=off go get github.com/mattn/goveralls
-          $(go env GOPATH)/bin/goveralls -coverprofile=profile.cov -service=github
-        if: matrix.go-version == '1.15.x' && matrix.os == 'ubuntu-latest'

.github/workflows/coverage.yml

@@ -0,0 +1,28 @@
+name: coverage
+on: [push, pull_request]
+
+jobs:
+  coverage:
+    strategy:
+      matrix:
+        go-version: [^1]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      GO111MODULE: "on"
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Coverage
+        env:
+          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          go test -race -covermode atomic -coverprofile=profile.cov ./...
+          GO111MODULE=off go get github.com/mattn/goveralls
+          $(go env GOPATH)/bin/goveralls -coverprofile=profile.cov -service=github