fix(ci): use docker socket instead of dind host

.gitea/workflows/build.yaml

@@ -6,19 +6,19 @@ on:
       - main
       - high-performance
 
-env:
-  DOCKER_HOST: tcp://docker-dind.gitea.svc.cluster.local:2375
-  DOCKER_TLS_CERTDIR: ""
-
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      DOCKER_HOST: unix:///var/run/docker.sock
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         run: |
+          export DOCKER_HOST=unix:///var/run/docker.sock
+          docker version
           docker buildx create --use || true
           docker buildx inspect --bootstrap
 
@@ -29,6 +29,7 @@ jobs:
           REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
         run: |
           set -euo pipefail
+          export DOCKER_HOST=unix:///var/run/docker.sock
           test -n "$REGISTRY_HOSTPORT"
           echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY_HOSTPORT" -u "$REGISTRY_USERNAME" --password-stdin
 
@@ -36,6 +37,8 @@ jobs:
         env:
           REGISTRY_HOSTPORT: ${{ secrets.REGISTRY_HOSTPORT }}
         run: |
+          set -euo pipefail
+          export DOCKER_HOST=unix:///var/run/docker.sock
           docker buildx build --push \
             -f Dockerfile \
             -t "$REGISTRY_HOSTPORT/nxtgauge-ai-assistant:${{ gitea.sha }}" \