chore(deps): update workflow action versions (#792)

## Summary
- `actions/checkout`: v4/v5 → v6
- `actions/setup-go`: v5 → v6
- `docker/build-push-action`: v5 → v6

All other actions (`goreleaser/goreleaser-action@v6`, `docker/setup-qemu-action@v3`, `docker/setup-buildx-action@v3`, `docker/login-action@v3`, `crazy-max/ghaction-import-gpg@v6`) were already at their latest major versions.

No breaking changes affect the current workflow configurations. The main changes in the updated actions are Node.js 24 runtime upgrades and minor feature additions.

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/792
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>

.gitea/workflows/release-nightly.yml

@@ -17,10 +17,10 @@ jobs:
   goreleaser:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version-file: "go.mod"
       - name: goreleaser
@@ -52,7 +52,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # all history for all branches and tags
 

.gitea/workflows/release-tag.yml

@@ -9,10 +9,10 @@ jobs:
   goreleaser:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # all history for all branches and tags
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version-file: "go.mod"
       - name: Import GPG key
@@ -46,7 +46,7 @@ jobs:
       DOCKER_LATEST: latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # all history for all branches and tags
 
@@ -69,7 +69,7 @@ jobs:
           echo REPO_VERSION=${GITHUB_REF_NAME#v} >> $GITHUB_OUTPUT
 
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile
@@ -83,7 +83,7 @@ jobs:
             ${{ env.DOCKER_ORG }}/${{ steps.meta.outputs.REPO_NAME }}:${{ env.DOCKER_LATEST }}
 
       - name: Build and push dind
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile
@@ -97,7 +97,7 @@ jobs:
             ${{ env.DOCKER_ORG }}/${{ steps.meta.outputs.REPO_NAME }}:${{ env.DOCKER_LATEST }}-dind
 
       - name: Build and push dind-rootless
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile

.gitea/workflows/test.yml

@@ -8,8 +8,8 @@ jobs:
     name: check and test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version-file: 'go.mod'
       - name: vet checks