Fix version generation and tag creation.

[pkaleta]

@jtratner

With this in place, we get:

➜  stor (fix-tagging) ✗ make version
4.0.0

and

➜  stor (master) ✗ make tag
echo "Tagging version as 4.0.0"
Tagging version as 4.0.0
git tag -a 4.0.0 -m "Version 4.0.0"
# We won't push changes or tags here allowing the pipeline to do that, so we don't accidentally do that locally.