Add Docker healthcheck with migration-friendly timings

Add HEALTHCHECK instruction to monitor Gitea service health using the
/api/healthz endpoint. Configured with:
- interval: 2m (check every 2 minutes, Gitea isn't that sensitive)
- start-period: 2m (allows time for migrations during upgrades)
- timeout: 10s
- retries: 3

This helps container orchestrators detect and restart unhealthy instances
while avoiding restarts during normal startup or database migrations.

Author: seuros

Dockerfile

@@ -46,7 +46,7 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 22 3000
 
-HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+HEALTHCHECK --interval=2m --timeout=10s --start-period=2m --retries=3 \
   CMD curl -f http://localhost:3000/api/healthz || exit 1
 
 RUN apk --no-cache add \

Dockerfile.rootless

@@ -44,7 +44,7 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 2222 3000
 
-HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+HEALTHCHECK --interval=2m --timeout=10s --start-period=2m --retries=3 \
   CMD curl -f http://localhost:3000/api/healthz || exit 1
 
 RUN apk --no-cache add \