Revert "Switch to GitHub-hosted runner with OIDC authentication"

This reverts commit 5fe7b04.

Author: pbasgod7

.github/workflows/build-and-push.yml

@@ -24,10 +24,7 @@ env:
 jobs:
   build-and-publish:
     name: Build and Publish Grafana Quickwit Image
-    runs-on: ubuntu-latest
-    permissions:
-      id-token: write
-      contents: read
+    runs-on: gha-runner-ecr-publish
     outputs:
       githash: ${{ steps.metadata.outputs.githash }}
       image_tag: ${{ steps.metadata.outputs.image_tag }}
@@ -38,12 +35,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v4
-        with:
-          role-to-assume: ${{ secrets.AWS_ROLE_ARN }}
-          aws-region: ${{ env.AWS_REGION_MGT }}
-
       - name: Generate metadata
         id: metadata
         run: |