build/ci: add patch to Dockerfile

Change-Id: I553bbaadd4bfcd0aefd838e2703548fc902c2b53
Reviewed-on: https://review.monogon.dev/c/monogon/+/1500
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/build/ci/Dockerfile b/build/ci/Dockerfile
index 4f6f4ec..460b31d 100644
--- a/build/ci/Dockerfile
+++ b/build/ci/Dockerfile
@@ -6,6 +6,7 @@
 	dotnet-runtime-6.0 \
 	jq \
 	tini \
+    patch \
     golang && \
     dnf clean all