bump golangci/golangci-lint-action from 4 to 6

Version 5 removed go cache management, and therefore also options skip-pkg-cache and
skip-build-cache, because the cache related to go itself is already handled by
actions/setup-go, and now it only caches golangci-lint analysis. Since we run multiple
golangci-lint-action steps for different goos, we want to cache package and build cache
and golangci-lint results from all of them, and therefore this commit now changes the
approach by disabling all built-in caching and introducing a separate cache step to
handle it properly.

.github/workflows/build.yml

@@ -223,24 +223,42 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Get runner parameters
+        id: get-runner-parameters
+        shell: bash
+        run: |
+          echo "year-week=$(/bin/date -u "+%Y%V")" >> $GITHUB_OUTPUT
+          echo "runner-os-version=$ImageOS" >> $GITHUB_OUTPUT
+
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Install Go
+        id: setup-go
         uses: actions/setup-go@v5
         with:
           go-version: '>=1.22.0-rc.1'
           check-latest: true
           cache: false
 
+      - name: Cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/.cache/golangci-lint
+          key: golangci-lint-${{ steps.get-runner-parameters.outputs.runner-os-version }}-go${{ steps.setup-go.outputs.go-version }}-${{ steps.get-runner-parameters.outputs.year-week }}-${{ hashFiles('go.sum') }}
+          restore-keys: golangci-lint-${{ steps.get-runner-parameters.outputs.runner-os-version }}-go${{ steps.setup-go.outputs.go-version }}-${{ steps.get-runner-parameters.outputs.year-week }}-
+
       - name: Code quality test (Linux)
-        uses: golangci/golangci-lint-action@v4
+        uses: golangci/golangci-lint-action@v6
         with:
           version: latest
-          skip-cache: false # Caching enabled (which is default) on this first lint step only, it handles complete cache of build, go modules and golangci-lint analysis which was necessary to get all lint steps to properly take advantage of it
+          skip-cache: true
 
       - name: Code quality test (Windows)
-        uses: golangci/golangci-lint-action@v4
+        uses: golangci/golangci-lint-action@v6
         env:
           GOOS: "windows"
         with:
@@ -248,7 +266,7 @@ jobs:
           skip-cache: true
 
       - name: Code quality test (macOS)
-        uses: golangci/golangci-lint-action@v4
+        uses: golangci/golangci-lint-action@v6
         env:
           GOOS: "darwin"
         with:
@@ -256,7 +274,7 @@ jobs:
           skip-cache: true
 
       - name: Code quality test (FreeBSD)
-        uses: golangci/golangci-lint-action@v4
+        uses: golangci/golangci-lint-action@v6
         env:
           GOOS: "freebsd"
         with:
@@ -264,7 +282,7 @@ jobs:
           skip-cache: true
 
       - name: Code quality test (OpenBSD)
-        uses: golangci/golangci-lint-action@v4
+        uses: golangci/golangci-lint-action@v6
         env:
           GOOS: "openbsd"
         with: