chore: upgrade Forgejo to v1.20.1-0

- Upgrade Forgejo to v1.20.1-0.
- Update the Dockerfile by removing the openssh-keygen binary as it is
  no longer used by default.

config

@@ -1 +1 @@
-Subproject commit 12990fc1ed88499a55d8b3656828236be2b736ff
+Subproject commit 3d98dde30afe04341c823309775c8248ac637d7e

magefiles/forgejo/download.json

@@ -1,5 +1,10 @@
 {
   "downloads": {
+    "1.20.1-0": {
+      "binary": "https://codeberg.org/attachments/4311f857-8337-42bb-8867-a686837fa524",
+      "signature": "https://codeberg.org/attachments/8eeb50ae-9b93-40ae-b06a-03d69c1188e9",
+      "digest": "https://codeberg.org/attachments/c7aa6d7f-7d88-40d7-b77b-1c8c6dff2885"
+    },
     "1.19.4-0": {
       "binary": "https://codeberg.org/attachments/8aac5e74-a26b-44c9-83b8-267f114af958",
       "signature": "https://codeberg.org/attachments/8e14bee9-2a08-41ad-879a-454e4360ab26",
@@ -19,16 +24,6 @@
       "binary": "https://codeberg.org/attachments/f83c11d7-a22b-4494-9f62-61660e81b559",
       "signature": "https://codeberg.org/attachments/24d04e8b-6c67-4ca5-a7fa-fc63fc905d6b",
       "digest": "https://codeberg.org/attachments/be383a36-2edd-49a6-aa1c-ea993ffac197"
-    },
-    "1.19.0-3": {
-      "binary": "https://codeberg.org/attachments/fafff70e-5070-4d15-9422-e54162e9a70d",
-      "signature": "https://codeberg.org/attachments/b9db4383-0397-4d04-b97c-1848108e1ced",
-      "digest": "https://codeberg.org/attachments/f9dbe298-7639-461a-99eb-2cb78ded6a9b"
-    },
-    "1.18.5-0": {
-      "binary": "https://codeberg.org/attachments/415526b5-e483-45b6-9d46-a7078dcea461",
-      "signature": "https://codeberg.org/attachments/25cbf994-c045-4252-8c4f-34285d8905a1",
-      "digest": "https://codeberg.org/attachments/79192b70-4bcf-4250-94e7-21085f04dd87"
     }
   }
 }

templates/forgejo/Dockerfile.gotmpl

@@ -1,5 +1,7 @@
 # This is a custom made Dockerfile for Gitea which is inspired from
 # the official Dockerfile.rootless from https://github.com/go-gitea/gitea/
+
+# syntax=docker/dockerfile:1
 FROM alpine:3.18
 
 ENV FORGEJO_WORK_DIR={{ .Forgejo.Work }} \
@@ -17,7 +19,6 @@ RUN apk update && apk upgrade && apk --no-cache add \
         git \
         curl \
         gnupg \
-        openssh-keygen \
     && addgroup -S -g {{ .FlowGID }} flow \
     && adduser -S -H -D -h {{ .Forgejo.Home }} -s /bin/bash -u {{ .Forgejo.LinuxUID }} -G flow git \
     && mkdir -p {{ .Forgejo.DataContainerDirectory }} {{ .Forgejo.Tmp }} \