Update docker/login-action action to v3

.forgejo/workflows/docker.yml

@@ -23,12 +23,9 @@ jobs:
           registry: cr.sp-codes.de
           username: ${{ secrets.CR_USERNAME }}
           password: ${{ secrets.CR_TOKEN }}
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
       - name: Build and push
         uses: docker/build-push-action@v4
         with:
-          platforms: linux/amd64,linux/arm64/v8
           push: true
           tags: |
             spcodes/coturn:4.6.2

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:12.5-slim
+FROM debian:12.5-slim@sha256:6bdbd579ba71f6855deecf57e64524921aed6b97ff1e5195436f244d2cb42b12
 
 ENV COTURN_VERSION="4.6.2"
 ENV PROMETHEUS_CLIENT_VERSION="v0.1.3"