Move NodeJS and Meteor install to .gitlab-ci.yml

Previously, NodeJS and Meteor versions were hard-coded in a special Dockerfile
for building meteor applications. Recently RocketChat began overly precise
version checks during the build process. This made regular manual changes of
the versions necessary. The versions are now extracted from the source tree.

Closes #3

.gitlab-ci.yml

@@ -16,10 +16,25 @@ autoupdate:
 
 .build:binary:
   extends: .build
-  image: registry.git.cccv.de/infra/packages/docker-images/meteor
+  image: registry.git.cccv.de/infra/packages/docker-images/bullseye
   script:
-  - meteor --version
   - git clone --depth 1 --branch ${UPSTREAM_VERSION} https://github.com/RocketChat/Rocket.Chat rocketchat
+  - NODEJS_VERSION="$(jq -r .engines.node rocketchat/package.json)"
+  - METEOR_VERSION="$(cut -d@ -f2 rocketchat/apps/meteor/.meteor/release)"
+  - wget -q "https://deb.nodesource.com/node_14.x/pool/main/n/nodejs/nodejs_${NODEJS_VERSION}-deb-1nodesource1_amd64.deb" -O nodejs.deb
+  - apt-get -qq install ./nodejs.deb
+  # NodeJS < 14.9.0 did not contain corepack
+  - test -e /usr/bin/corepack || npm install -g corepack
+  # Install/enable yarn
+  - corepack enable
+  - rm nodejs.deb
+  - wget -q "https://static-meteor.netdna-ssl.com/packages-bootstrap/${METEOR_VERSION}/meteor-bootstrap-os.linux.x86_64.tar.gz" -O meteor-bootstrap.tar.gz
+  # The package only contains an ".meteor" directory that ends up in "/root/.meteor"
+  - tar -C ~/ -xzf meteor-bootstrap.tar.gz
+  - rm meteor-bootstrap.tar.gz
+  - export METEOR_ALLOW_SUPERUSER=true
+  - export PATH=$PATH:/root/.meteor
+  - meteor --version
   - cd rocketchat && YARN_CHECKSUM_BEHAVIOR=update yarn install --json && git diff yarn.lock && cd ..
   - cd rocketchat && yarn build:ci -- --directory $(pwd)/../build && cd ..
   - cd build/bundle/programs/server/ && npm install --production && cd ../../../..