Update CI workflows to latest action versions and expand Go matrix

- Bump checkout, setup-go to v6; golangci-lint-action to v9
- Replace container-based test setup with setup-go for Go 1.19-1.25
- Fix Postgres service connectivity with port mapping and health checks
- Remove obsolete .golangci.yml (incompatible with golangci-lint v2)

Author: olomix

.github/workflows/lint.yaml

@@ -10,10 +10,10 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
         with:
-          go-version: 1.20.2
-      - uses: golangci/golangci-lint-action@v3
+          go-version: 1.25.7
+      - uses: golangci/golangci-lint-action@v9
         with:
-          version: v1.52.1
+          version: v2.8.0

.github/workflows/test.yaml

@@ -10,30 +10,37 @@ jobs:
   test:
     strategy:
       matrix:
-        containers:
-        - 1.19.7-bullseye
-        - 1.20.2-bullseye
+        go-version:
+        - "1.19"
+        - "1.20"
+        - "1.21"
+        - "1.22"
+        - "1.23"
+        - "1.24"
+        - "1.25"
     runs-on: ubuntu-latest
-    container: golang:${{ matrix.containers }}
     env:
       PGPASSWORD: pgpwd
-      PGHOST: postgres
+      PGHOST: localhost
       PGUSER: postgres
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
-      - uses: actions/cache@v3
+        uses: actions/checkout@v6
+      - name: Setup Go
+        uses: actions/setup-go@v6
         with:
-          path: |
-            ~/.cache/go-build
-            /go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version: ${{ matrix.go-version }}
       - name: Unit Tests
         run: go test -v -race -timeout=60s ./...
     services:
       postgres:
         image: postgres:14.2
         env:
           POSTGRES_PASSWORD: pgpwd
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5