CI: Check man page without altering $MANPATH

This removes unneeded addition to $MANPATH for CircleCI.
Also, wheel is built and installed with root privileges, so man
page gets placed under the proper path.

Closes coala#5321

.ci/check_man.sh

@@ -4,7 +4,6 @@ set -e
 
 if [ $CIRCLECI ]; then
   sudo apt install man
-  export MANPATH=$MANPATH:~/.local/man
 elif [ $TRAVIS ]; then
   export MANPATH=$MANPATH:$VIRTUAL_ENV/man
 fi

.circleci/config.yml

@@ -47,7 +47,8 @@ jobs:
           when: always
           command: |
             [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
-            pip install --user .
+            python setup.py bdist_wheel
+            sudo pip install ./dist/coala-*.whl
             pip install --user coala-bears[alldeps] --pre -U
             pip install --user "packaging~=16.8"
             ./coala --non-interactive