.gitpod-setup-trac-remote.sh: Only set up the read-only remote

.gitpod-setup-trac-remote.sh

@@ -4,26 +4,5 @@
 set -e
 
 # Setup trac as remote
-## In order to push to trac, generate a new key with `ssh-keygen -f tempkey` and save the private key to gitpod `gp env PRIVATE_SSH_KEY="$(<tempkey)"` (or by following https://www.gitpod.io/docs/environment-variables#using-the-account-settings)
-## then follow https://doc.sagemath.org/html/en/developer/trac.html#linking-your-public-key-to-your-trac-account to register the public key with trac.
-## Afterwards, create a new gitpod workspace.
-git remote remove trac 2> /dev/null || true # might still exists from a previous run/prebuild
-if [[ -n "${PRIVATE_SSH_KEY}" ]]; then
-  # Setup ssh key for authentication with trac
-  mkdir -p ~/.ssh
-  echo $PRIVATE_SSH_KEY | sed 's/\(-----\(BEGIN\|END\) OPENSSH PRIVATE KEY-----\)/\n\1\n/g' > ~/.ssh/id_rsa
-  sed -i '/^$/d' ~/.ssh/id_rsa
-  chmod 600 ~/.ssh/id_rsa
-  echo "PubkeyAcceptedKeyTypes +ssh-rsa" > ~/.ssh/config
-  ssh-keyscan -H trac.sagemath.org >> ~/.ssh/known_hosts
-
-  # Setup trac repo
-  git remote add trac [email protected]:sage.git -t master -t develop -t $(git branch --show-current)
-  git remote set-url --push trac [email protected]:sage.git
-  git fetch trac
-  git branch -u trac/$(git branch --show-current)
-else
-  # Fallback to sagemath mirror
-  git remote add trac https://github.com/sagemath/sagetrac-mirror.git -t master -t develop
-  git remote set-url --push trac pushing-needs-ssh-key
-fi
+git remote add trac https://github.com/sagemath/sagetrac-mirror.git -t master -t develop
+git remote set-url --push trac no-pushing--this-is-a-read-only-archive