ci: allow riscv64-linux on Forgejo Actions to run on PRs for now

Since it's not currently running on pushes to master, there's plenty of capacity
to run it on PRs on the Codeberg side.

Author: alexrp

.forgejo/workflows/ci.yaml

@@ -55,7 +55,7 @@ jobs:
         run: sh ci/loongarch64-linux-release.sh
         timeout-minutes: 180
   riscv64-linux-debug:
-    if: github.event_name != 'pull_request'
+    # if: github.event_name != 'pull_request'
     runs-on: [self-hosted, riscv64-linux]
     steps:
       - name: Checkout
@@ -66,7 +66,7 @@ jobs:
         run: sh ci/riscv64-linux-debug.sh
         timeout-minutes: 420
   riscv64-linux-release:
-    if: github.event_name != 'pull_request'
+    # if: github.event_name != 'pull_request'
     runs-on: [self-hosted, riscv64-linux]
     steps:
       - name: Checkout