ci: update golangci-lint and split go-test to separate workflow

.github/workflows/go-test.yml

@@ -0,0 +1,26 @@
+name: go-test
+
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  go-test:
+    name: go-test
+    strategy:
+      matrix:
+        go-version: [1.20.x, 1.21.x]
+        # XXX: is it actually useful to run unit tests on macOS?
+        platform: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: go-test
+        run: go test ./...

.github/workflows/golangci-lint.yml

@@ -1,36 +1,33 @@
 # This file was copied from the following URL and modified:
 # https://github.com/golangci/golangci-lint-action/blob/master/README.md#how-to-use
 
-name: golangci
+name: golangci-lint
 on:
   push:
     tags:
       - v*
     branches:
-      - master
       - main
   pull_request:
+
 permissions:
   contents: read
   pull-requests: read
+
 jobs:
   golangci:
     name: lint
-    strategy:
-      matrix:
-        go-version: [1.20.x, 1.21.x]
-        platform: [ubuntu-latest, macos-latest]
-    runs-on: ${{ matrix.platform }}
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v3
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
         with:
-          go-version: ${{ matrix.go-version }}
+          go-version: 1.21.x
+          cache: false
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.53.3 # current version at time of commit
-          args: --timeout 10m
-          only-new-issues: true
-      - name: go-test
-        run: go test ./...
+          version: v1.54 # current version at time of commit
+          args: --timeout=10m
+          # Only show new issues in a PR but show all issues for pushes
+          only-new-issues: ${{ github.event_name == 'pull_request' && 'true' || 'false' }}