Add integration testing

__test__/entrypoint.sh

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+#!/bin/sh -l
+set -euo pipefail
+
+# Save the working directory
+WORKINGDIR=$PWD
+
+# Serve remote repo
+mkdir /git
+git init --bare /git/test-repo.git
+git daemon --verbose --enable=receive-pack --base-path=/git --export-all /git/test-repo.git &>/dev/null &
+
+# Give the daemon time to start
+sleep 2
+
+# Clone and make an initial commit
+git clone git://127.0.0.1/test-repo.git /git/test-repo
+cd /git/test-repo
+git config --global user.email "you@example.com"
+git config --global user.name "Your Name"
+echo "#test-repo" > README.md
+git add .
+git commit -m "initial commit"
+git push -u
+
+# Restore the working directory
+cd $WORKINGDIR
+
+# Execute integration tests
+jest int