Add mjolnir host running mjolnir for Matrix moderation

Also see:
https://wiki.hamburg.ccc.de/infrastructure:services:mjolnir

.sops.yaml

@@ -15,6 +15,7 @@ keys:
   - &host_age_matrix age1f7ams0n2zy994pzt0u30h8tex6xdcernj59t4d70z4kjsyzrr3wsy87xzk
   - &host_age_netbox age13fqs76z2vl5l84dvmmlqjj5xkfsfe85xls8uueul7re9j3ksjs0sw2xc9e
   - &host_age_public_web_static age19s7r8sf7j6zk24x9vumawgxpd2q8epyv7p9qsjntw7v9s3v045mqhmsfp0
+  - &host_age_mjolnir age1ej52kwuj8xraxdq685eejj4dmxpfmpgt4d8jka98rtpal6xcueqq9a6wae
 creation_rules:
   - path_regex: config/hosts/git/.*
     key_groups:
@@ -96,6 +97,22 @@ creation_rules:
           - *admin_gpg_dante
         age:
           - *host_age_public_web_static
+  - path_regex: config/hosts/mjolnir/.*
+    key_groups:
+      - pgp:
+          - *admin_gpg_djerun
+          - *admin_gpg_stb
+          - *admin_gpg_jtbx
+          - *admin_gpg_yuri
+          - *admin_gpg_june
+          - *admin_gpg_haegar
+          - *admin_gpg_dario
+          - *admin_gpg_echtnurich
+          - *admin_gpg_max
+          - *admin_gpg_c6ristian
+          - *admin_gpg_dante
+        age:
+          - *host_age_mjolnir
   - key_groups:
       - pgp:
           - *admin_gpg_djerun