Print which git version we are using for running integration tests

I usually use something like

   PATH=~/git-versions/2.22.0/bin:$PATH ./scripts/run_integration_tests.sh

for running integration tests with an older version. This has the problem that
when you specify a version that you don't have locally, it will silently use the
current version. Guard against that by printing the version it is using.

Author: stefanhaller

scripts/run_integration_tests.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+echo "Running integration tests with $(git --version)"
+
 # This is ugly, but older versions of git don't support the GIT_CONFIG_GLOBAL
 # env var; the only way to run tests for these old versions is to copy our test
 # config file to the actual global location. Move an existing file out of the