feat(web): separate build sources and localize time

server/Dockerfile

@@ -5,11 +5,15 @@ COPY packages/core/package.json ./packages/core/package.json
 RUN cd web && npm ci --no-audit --no-fund
 COPY packages/core/ ./packages/core/
 COPY web/ ./web/
-ARG WEBDROP_BUILD_COMMIT=unknown
-ARG WEBDROP_BUILD_TAG=unknown
+ARG WEBDROP_FRONTEND_COMMIT=unknown
+ARG WEBDROP_FRONTEND_TAG=unknown
+ARG WEBDROP_BACKEND_COMMIT=unknown
+ARG WEBDROP_BACKEND_TAG=unknown
 ARG WEBDROP_BUILD_TIME=unknown
-ENV WEBDROP_BUILD_COMMIT=$WEBDROP_BUILD_COMMIT \
-    WEBDROP_BUILD_TAG=$WEBDROP_BUILD_TAG \
+ENV WEBDROP_FRONTEND_COMMIT=$WEBDROP_FRONTEND_COMMIT \
+    WEBDROP_FRONTEND_TAG=$WEBDROP_FRONTEND_TAG \
+    WEBDROP_BACKEND_COMMIT=$WEBDROP_BACKEND_COMMIT \
+    WEBDROP_BACKEND_TAG=$WEBDROP_BACKEND_TAG \
     WEBDROP_BUILD_TIME=$WEBDROP_BUILD_TIME
 RUN npm run build --prefix web