Add full path for git worktree (bis)

Dockerfile.build

@@ -2,7 +2,7 @@ FROM clangml-transforms
 RUN git pull
 RUN cd /home/opam/memcad && git pull
 RUN cd /home/opam/clangml-transforms && git pull
-RUN . /home/opam/.profile && cd clangml-transforms && \
+RUN . /home/opam/.profile && cd /home/opam/clangml-transforms && \
     dune build clangml-transforms.opam
 RUN opam update && opam upgrade && opam install clangml-transforms
 RUN cd /home/opam/memcad && git pull