Git – Ignoring a specific modification to a config file

filters are made for stuff like this. In your repo,

cat >.git/info/saved-connection <<EOD
<setting name="ConnectionString"><value>Server=prodServer;Database=myDataBase;</value></setting>
EOD

cat >.git/info/my-connection <<EOD
<setting name="ConnectionString"><value>Server=myprivateserver;Database=myDataBase;</value></setting>
EOD

git config filter.use-my-connection.smudge 'sed -f ".git/info/use-my-connection.smudge"'
git config filter.use-my-connection.clean  'sed -f ".git/info/use-my-connection.clean"'

cat >.git/info/use-my-connection.smudge    <<EOD
/^<setting name="ConnectionString">/ {
     w .git/info/saved-connection
     r .git/info/my-connection
     d
}
EOD

cat >.git/info/use-my-connection.clean     <<EOD
/^<setting name="ConnectionString">/ {
     w .git/info/my-connection
     r .git/info/saved-connection
     d
}
EOD

echo >> .git/info/attributes     path/to/app.config filter=use-my-connection

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