remove pixelfed from CI until fixed (#472)

this test is still borked as per #33.
the intent would be to get this test on a feature branch pertaining to that issue - the point being we should be able to rely on CI's boolean result for detecting (newly induced) regressions.

Reviewed-on: #472
Co-authored-by: Kiara Grouwstra <kiara@procolix.eu>
Co-committed-by: Kiara Grouwstra <kiara@procolix.eu>

.forgejo/workflows/ci.yaml

@@ -27,12 +27,6 @@ jobs:
       - uses: actions/checkout@v4
       - run: nix build .#checks.x86_64-linux.test-mastodon-service -L
 
-  check-pixelfed:
-    runs-on: native
-    steps:
-      - uses: actions/checkout@v4
-      - run: nix build .#checks.x86_64-linux.test-pixelfed-garage-service -L
-
   check-peertube:
     runs-on: native
     steps: