Autocomplete axolotl CLI (#2955)

* static autocomplete script for axolotl cli

* use list of commands that should autocomplete yaml files

* make sure to chmod the autocomplete script as executable

* shellcheck and fix autocompletion of directory/sub-dirs

* more shellcheck fixes

docker/Dockerfile

@@ -31,7 +31,11 @@ RUN if [ "$AXOLOTL_EXTRAS" != "" ] ; then \
     pip install pytest && \
     pip cache purge
 
-# fix so that git fetch/pull from remote works
+# fix so that git fetch/pull from remote works with shallow clone
 RUN git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" && \
     git config --get remote.origin.fetch && \
     git config --global credential.helper store
+
+COPY .axolotl-complete.bash /root/.axolotl-complete.bash
+RUN chmod +x /root/.axolotl-complete.bash && \
+    echo 'source /root/.axolotl-complete.bash' >> ~/.bashrc