feat: add tini to remove zombie git processes

[CasLubbers]

📌 Summary

long running operator contains a lot of zombie git processes. (steveukx/git-js#1062). Recommended is to use tini so that the processes are getting cleaned up

1001     3076711  0.0  0.0      0     0 ?        Z    Mar27   0:00 [git] <defunct>
1001     3076716  0.0  0.0      0     0 ?        Z    Mar27   0:00 [git] <defunct>
1001     3076721  0.0  0.0      0     0 ?        Z    Mar27   0:00 [git] <defunct>
1001     3076726  0.0  0.0      0     0 ?        Z    Mar27   0:00 [git] <defunct>
1001     3076731  0.0  0.0      0     0 ?        Z    Mar27   0:00 [git] <defunct>
1001     3839099  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839104  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839109  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839114  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839119  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839124  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839129  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839134  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>
1001     3839139  0.0  0.0      0     0 ?        Z    Mar31   0:00 [git] <defunct>

🔍 Reviewer Notes

🧹 Checklist

• Code is readable, maintainable, and robust.
• Unit tests added/updated