treewide: force mirror urls to https

Change-Id: If661078d9c5f9b75d4918a00de7ad54069d06b7c
Reviewed-on: https://review.monogon.dev/c/monogon/+/4232
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/build/bazel/bazel_downloader.cfg b/build/bazel/bazel_downloader.cfg
index 92a7e1d..0cf11a2 100644
--- a/build/bazel/bazel_downloader.cfg
+++ b/build/bazel/bazel_downloader.cfg
@@ -10,7 +10,7 @@
 
 # Allow requests to our mirror and rewrite all urls to use said mirror.
 allow mirror.monogon.dev
-rewrite ^((?!go\.dev|bcr\.bazel\.build|api\.github\.com).*) mirror.monogon.dev/$1
+rewrite ^((?!go\.dev|bcr\.bazel\.build|api\.github\.com).*) https://mirror.monogon.dev/$1
 
 # Block all other URLs. You can comment out this one to allow a fallback.
 block *