[CI] Forgejo Actions based release process (squash) no ownca

The private Forgejo instance trusted with the release signing keys no
longer requires the installation of the ownca certificate authority.

Refs: https://codeberg.org/forgejo/docs/pulls/338
(cherry picked from commit 72f9ae796d)

.forgejo/workflows/publish-release.yml

@@ -13,7 +13,7 @@
 #  DOER: forgejo-experimental-ci
 #  TOKEN: <generated from codeberg.org/forgejo-experimental-ci>
 #
-# https://forgejo.octopuce.forgejo.org/forgejo/forgejo
+# http://private.forgejo.org/forgejo/forgejo
 #
 #  Copies & sign a release from codeberg.org/forgejo-integration to codeberg.org/forgejo
 #
@@ -37,13 +37,6 @@ jobs:
     runs-on: self-hosted
     if: secrets.DOER != '' && secrets.FORGEJO != '' && secrets.TO_OWNER != '' && secrets.FROM_OWNER != '' && secrets.TOKEN != ''
     steps:
-      - name: install the certificate authority
-        if: secrets.ROLE == 'forgejo-release'
-        run: |
-          apt-get install -qq -y wget
-          wget --no-check-certificate -O /usr/local/share/ca-certificates/enough.crt https://forgejo.octopuce.forgejo.org/forgejo/enough/raw/branch/main/certs/2023-05-13/ca.crt
-          update-ca-certificates --fresh
-
       - uses: actions/checkout@v3
 
       - name: copy & sign binaries and container images from one owner to another