added rtmp module to nginx image

.gitea/workflows/build-nginx.yaml

@@ -9,14 +9,6 @@ jobs:
   "Build nginx docker images":
     runs-on: woryzen
     steps:
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3.4.0
-        with:
-          driver: docker-container
-          platforms: |
-            linux/amd64
-            linux/arm64
       -
         name: Login to Gitea container registry
         uses: docker/login-action@v3
@@ -28,10 +20,12 @@ jobs:
         name: Build and push nginx vanilla images
         uses: docker/build-push-action@v6
         with:
+          builder: multiplatform-builder
           context: "{{defaultContext}}:nginx"
           platforms: |
             linux/amd64
             linux/arm64
+            linux/arm32
           push: true
           pull: true
           ssh: default=/home/luser/.ssh/id_ed25519
@@ -50,10 +44,12 @@ jobs:
         name: Build and push nginx custom images
         uses: docker/build-push-action@v6
         with:
+          builder: multiplatform-builder
           context: "{{defaultContext}}:nginx"
           platforms: |
             linux/amd64
             linux/arm64
+            linux/arm32
           push: true
           pull: true
           ssh: default=/home/luser/.ssh/id_ed25519