deploy: fix build-dir git calls, capture SHA, drop dead mkdir

deploy.sh cd'd into the mktemp build dir before calling git, so
`git archive HEAD` failed with 'not a git repository' and the whole
deploy aborted. Resolve REPO from the script location and pass -C to
every git call, and write the archive to an absolute path since -C also
makes --output relative to the repo.

The deploy marker also ran `git rev-parse` from the temp dir; because it
sat inside a command substitution, set -e did not catch it and
last-deploy.txt silently recorded an empty commit. Capture SHA up front.

Also drop `mkdir -p public/cv`, left over from when the CV was copied
into a directory that nothing reads.

0 files changed, 0 insertions, 0 deletions