My Automator Workflow fails because it fails to find the git command within the ‘Run Shell Script’ command? Need help

I have an Automator workflow and one of the actions is to clone a repository. Here's the code for the 'Run Shell Script' action. The command is run within the Bash shell /bin/bash if that matters:

SOURCEDIR="${3/\/Volumes/}"

cd "$2"
REPOURL="bob@somedomain.com:$SOURCEDIR"
WORKINGDIR="$1"

# Capture any errors with cloning process in log file
git clone "$REPOURL" "$WORKINGDIR" &> ./log.txt

// For debugging
echo "exit code: $?"
echo "PPID: $PPID"

open .

Now the Automator App runs fine on my machine. The path to git on my machine (A Macbook Pro) is: /usr/bin/git (I believe I installed git on my machine through Xcode)

But on my co-worker's machine (Also a Mac Pro) the Automator App fails. In fact, the output of the log.txt file says: bash: git: command not found

Now on my co-worker's machine the path to git is: usr/local/git/bin, which, yes, is different because he installed git through the Google Git Installer for Mac OS X, but I didn't think it should matter because in the script the git command is not absolute path to the command and further more my co-worker can run git normally from a Bash script but when invoked directly from the Terminal.

So what gives? Why does the automator workflow work for me but not for my co-worker?

There must be something fundamental about Bash or Unix that I'm not understanding here but I'm lost.