ci: skip TLS verify for actions/checkout on LAN Gitea

The Gitea host serves https://gitea.iliadenisov.ru with a cert signed
by host-Caddy's internal CA, which the runner-image's CA bundle does
not trust. actions/checkout@v4 fails on `git fetch` as a result, so
every workflow on gitea.lan has been failing — visible only now that
we made gitea.lan the primary CI target.

Sets GIT_SSL_NO_VERIFY=true on every workflow as a quick fix. Safe in
practice because both endpoints sit on the same LAN. The long-term
fix is to bake the Caddy root CA into the runner image and drop this
env.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/go-unit.yaml

@@ -30,6 +30,15 @@ on:
       - '.gitea/workflows/go-unit.yaml'
       - '!**/*.md'
 
+env:
+  # The Gitea host serves https://gitea.iliadenisov.ru with a cert
+  # signed by host-Caddy's internal CA. The runner-image's CA bundle
+  # does not include that root, so actions/checkout fails on `git
+  # fetch`. Disabling SSL verify is acceptable for this LAN-only
+  # infrastructure; the long-term fix is to mount the Caddy root CA
+  # into the runner image.
+  GIT_SSL_NO_VERIFY: "true"
+
 jobs:
   test:
     runs-on: ubuntu-latest