Support custom venv directory

When using CI, we want to use a fresh venv for every build so bad venv
created by one job does not break the next job, or bad change in a PR is
not hidden by good venv created by a previous job.

When using local development, you may want to have venv per ramen source
directory. One case is using git worktree to have multiple ramen trees.
With this change you can create a venv per ramen worktree.

Example usage:

    hack/make-venv .venv/ramen

Since this is the expected usage, add this path to gitignore, so using
`git clean dxf` does not remove the directory.

Signed-off-by: Nir Soffer <[email protected]>

.gitignore

@@ -33,6 +33,7 @@ config/hub/bundle
 .zed
 
 # Generated files
+.venv
 venv
 
 # Test enviromemnt generated files

hack/make-venv

@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-venv=~/.venv/ramen
+venv=${1:-~/.venv/ramen}
 
 if [ -d "$venv" ]; then
     echo "Virtual environemnt exists: '$venv'"