fix(s3): use us-east-1 region and force S3 cache fetch in CI

.gitea/actions/go-cache/action.yml

@@ -21,7 +21,7 @@ inputs:
     required: false
   s3-region:
     description: S3 region name.
-    default: auto
+    default: us-east-1
     required: false
   s3-endpoint:
     description: Optional S3-compatible endpoint URL, for example https://s3.example.com.

.gitea/workflows/ci.yml

@@ -30,12 +30,13 @@ jobs:
         env:
           SCCACHE_AWS_ACCESS_KEY_ID: ${{ secrets.SCCACHE_AWS_ACCESS_KEY_ID }}
           SCCACHE_AWS_SECRET_ACCESS_KEY: ${{ secrets.SCCACHE_AWS_SECRET_ACCESS_KEY }}
-          AWS_REGION: auto
+          AWS_REGION: us-east-1
 
       - name: Clean Local Go Cache (Start Fresh)
         run: |
           echo "Clearing local cache..."
           go clean -cache
+          rm -rf ~/.cache/go-cache
 
       - name: Cold Build (Cache Miss / Populates S3)
         run: |
@@ -46,6 +47,7 @@ jobs:
         run: |
           echo "Clearing local cache to force remote S3 fetch..."
           go clean -cache
+          rm -rf ~/.cache/go-cache
 
       - name: Warm Build (Cache Hit / Fetches from S3)
         run: |