fix(ci): Force fresh base image in Docker builds

Add --pull and --no-cache flags to docker buildx build to ensure:
- Base image (node:22.20-alpine) is always pulled fresh
- No cached layers from previous builds are used

This fixes issue #1079 where published images contained outdated
Node.js v20.18.x instead of the expected v22.20.x from Dockerfile.dev,
causing Prisma 7 compatibility failures.

Fixes #1079

.github/workflows/build-containers.yml

@@ -53,6 +53,8 @@ jobs:
             -f Dockerfile.dev \
             -t ghcr.io/gitroomhq/postiz-app:${{ env.CONTAINERVER }}-${{ matrix.arch }} \
             --build-arg NEXT_PUBLIC_VERSION=${{ env.NEXT_PUBLIC_VERSION }} \
+            --pull \
+            --no-cache \
             --provenance=false --sbom=false \
             --output "type=registry,name=ghcr.io/gitroomhq/postiz-app:${{ env.CONTAINERVER }}-${{ matrix.arch }}" .