fix: fix login image (#10355)

# Which Problems Are Solved

The broken login image is fixed.

# How the Problems Are Solved

The most important learnings from
https://github.com/zitadel/zitadel/pull/10318 are applied:
- Path in entrypoint is fixed: `exec node /runtime/apps/login/server.js`
- .dockerignore is updated so CSS styles are built into the image
- `source: .` is passed to the docker-bake action. Without this,
docker-bake builds from a remote context, which seems to be slow and not
updated on new PR commits. Looks like the bake action uploads an
artifact that [conflicts with the compile
workflow](https://github.com/zitadel/zitadel/actions/runs/16620417216/job/47023478437).
Therefore, a pattern is added to the compile workflow so only relevant
artifacts are selected.

build/login/Dockerfile

@@ -24,9 +24,9 @@ COPY . .
 RUN pnpm turbo build:login:standalone
 
 FROM scratch AS build-out
-COPY --from=build /app/apps/login/.next/standalone /
-COPY --from=build /app/apps/login/.next/static /.next/static
-COPY --from=build /app/apps/login/public /public
+COPY /apps/login/public ./apps/login/public
+COPY --from=build /app/apps/login/.next/standalone ./
+COPY --from=build /app/apps/login/.next/static ./apps/login/.next/static
 
 FROM base AS login-standalone
 WORKDIR /runtime
@@ -34,7 +34,7 @@ RUN addgroup --system --gid 1001 nodejs && \
     adduser --system --uid 1001 nextjs
 # If /.env-file/.env is mounted into the container, its variables are made available to the server before it starts up.
 RUN mkdir -p /.env-file && touch /.env-file/.env && chown -R nextjs:nodejs /.env-file
-COPY apps/login/scripts ./
+COPY --chown=nextjs:nodejs apps/login/scripts ./
 COPY --chown=nextjs:nodejs --from=build-out . .
 USER nextjs
 ENV HOSTNAME="0.0.0.0"

build/login/Dockerfile.dockerignore

@@ -8,7 +8,8 @@
 !apps/login/next.config.mjs
 !apps/login/next-env-vars.d.ts
 !apps/login/next-env.d.ts
-!apps/login/tailwind.config.js
+!apps/login/tailwind.config.mjs
+!apps/login/postcss.config.cjs
 !apps/login/tsconfig.json
 !apps/login/package.json
 !apps/login/turbo.json
@@ -23,6 +24,7 @@
 !packages/zitadel-proto/turbo.json
 
 !packages/zitadel-client/package.json
+!packages/zitadel-client/**/package.json
 !packages/zitadel-client/src
 !packages/zitadel-client/tsconfig.json
 !packages/zitadel-client/tsup.config.ts
@@ -30,8 +32,7 @@
 
 !proto
 
-*.md
-*.png
-node_modules
-*.test.ts
-*.test.tsx
+**/*.md
+**/node_modules
+**/*.test.ts
+**/*.test.tsx