[tests] Fix concurrency for docker loing action (#1014)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Chores**
- Updated workflow steps to use a job-specific temporary directory for
Docker configuration during build and container registry login
processes. This enhances isolation of Docker credentials in CI jobs.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/pull-requests.yaml

@@ -33,9 +33,13 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: ghcr.io
+        env:
+          DOCKER_CONFIG: ${{ runner.temp }}/.docker
 
       - name: Build
         run: make build
+        env:
+          DOCKER_CONFIG: ${{ runner.temp }}/.docker
 
       - name: Build Talos image
         run: make -C packages/core/installer talos-nocloud

.github/workflows/tags.yaml

@@ -99,11 +99,15 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: ghcr.io
+        env:
+          DOCKER_CONFIG: ${{ runner.temp }}/.docker
 
       # Build project artifacts
       - name: Build
         if: steps.check_release.outputs.skip == 'false'
         run: make build
+        env:
+          DOCKER_CONFIG: ${{ runner.temp }}/.docker
 
       # Commit built artifacts
       - name: Commit release artifacts