feat: support reverse proxy path prefix deployments (#257)

* feat: support reverse proxy path prefixes

* fix: respect BASE_URL in SAML callback fallback

* fix: make BASE_URL runtime configurable

Dockerfile

@@ -16,6 +16,7 @@ COPY . .
 RUN bun run build
 RUN mkdir -p dist/scripts && \
   for script in scripts/*.ts; do \
+  if [ "$(basename "$script")" = "runtime-server.ts" ]; then continue; fi; \
   bun build "$script" --target=bun --outfile=dist/scripts/$(basename "${script%.ts}.js"); \
   done
 
@@ -59,6 +60,7 @@ COPY --from=pruner /app/node_modules ./node_modules
 COPY --from=builder /app/dist ./dist
 COPY --from=builder /app/package.json ./package.json
 COPY --from=builder /app/docker-entrypoint.sh ./docker-entrypoint.sh
+COPY --from=builder /app/scripts/runtime-server.ts ./scripts/runtime-server.ts
 COPY --from=builder /app/drizzle ./drizzle
 
 # Remove build-only packages that are not needed at runtime
@@ -73,6 +75,7 @@ ENV NODE_ENV=production
 ENV HOST=0.0.0.0
 ENV PORT=4321
 ENV DATABASE_URL=file:data/gitea-mirror.db
+ENV BASE_URL=/
 
 # Create directories and setup permissions
 RUN mkdir -p /app/certs && \
@@ -90,6 +93,6 @@ VOLUME /app/data
 EXPOSE 4321
 
 HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
-  CMD wget --no-verbose --tries=1 --spider http://localhost:4321/api/health || exit 1
+  CMD sh -c 'BASE="${BASE_URL:-/}"; if [ "$BASE" = "/" ]; then BASE=""; else BASE="${BASE%/}"; fi; wget --no-verbose --tries=1 --spider "http://localhost:4321${BASE}/api/health" || exit 1'
 
 ENTRYPOINT ["./docker-entrypoint.sh"]