Fix undefined vars build warnings in Dockerfile

[replaceafill]

Similar to https://github.com/artefactual/archivematica-storage-service/pull/734 this fixes the following build warnings:

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```console $ docker build --check . [+] Building 0.7s (4/4) FINISHED docker:default => [internal] load build definition from Dockerfile 0.0s => => transferring dockerfile: 9.00kB 0.0s => [internal] load metadata for docker.io/library/node:20 0.6s => [internal] load metadata for docker.io/library/ubuntu:22.04 0.7s => [internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s WARNING: UndefinedVar - https://docs.docker.com/go/dockerfile/rule/undefined-var/ Usage of undefined variable '$USER_ID' Dockerfile:139 -------------------- 137 | && rm -rf /var/lib/apt/lists/* /var/cache/apt/* 138 | 139 | >>> COPY --chown=${USER_ID}:${GROUP_ID} --from=browsers-builder --link ${SELENIUM_DIR} ${SELENIUM_DIR} 140 | COPY --chown=${USER_ID}:${GROUP_ID} --from=archivematica-dashboard-frontend-builder --link /src/src/dashboard/frontend/node_modules /src/src/dashboard/frontend/node_modules 141 | COPY --link src/dashboard/frontend /src/src/dashboard/frontend -------------------- WARNING: UndefinedVar - https://docs.docker.com/go/dockerfile/rule/undefined-var/ Usage of undefined variable '$GROUP_ID' Dockerfile:139 -------------------- 137 | && rm -rf /var/lib/apt/lists/* /var/cache/apt/* 138 | 139 | >>> COPY --chown=${USER_ID}:${GROUP_ID} --from=browsers-builder --link ${SELENIUM_DIR} ${SELENIUM_DIR} 140 | COPY --chown=${USER_ID}:${GROUP_ID} --from=archivematica-dashboard-frontend-builder --link /src/src/dashboard/frontend/node_modules /src/src/dashboard/frontend/node_modules 141 | COPY --link src/dashboard/frontend /src/src/dashboard/frontend -------------------- WARNING: UndefinedVar - https://docs.docker.com/go/dockerfile/rule/undefined-var/ Usage of undefined variable '$USER_ID' Dockerfile:140 -------------------- 138 | 139 | COPY --chown=${USER_ID}:${GROUP_ID} --from=browsers-builder --link ${SELENIUM_DIR} ${SELENIUM_DIR} 140 | >>> COPY --chown=${USER_ID}:${GROUP_ID} --from=archivematica-dashboard-frontend-builder --link /src/src/dashboard/frontend/node_modules /src/src/dashboard/frontend/node_modules 141 | COPY --link src/dashboard/frontend /src/src/dashboard/frontend 142 | -------------------- WARNING: UndefinedVar - https://docs.docker.com/go/dockerfile/rule/undefined-var/ Usage of undefined variable '$GROUP_ID' Dockerfile:140 -------------------- 138 | 139 | COPY --chown=${USER_ID}:${GROUP_ID} --from=browsers-builder --link ${SELENIUM_DIR} ${SELENIUM_DIR} 140 | >>> COPY --chown=${USER_ID}:${GROUP_ID} --from=archivematica-dashboard-frontend-builder --link /src/src/dashboard/frontend/node_modules /src/src/dashboard/frontend/node_modules 141 | COPY --link src/dashboard/frontend /src/src/dashboard/frontend 142 | -------------------- ```