ci: fix SSH deploy key mount path for Forgejo runner

.forgejo/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     container:
       image: rust:bookworm
       volumes:
-        - /root/.ssh:/root/.ssh:ro
+        - /opt/runner/keys:/keys:ro
 
     steps:
       - name: Install tools
@@ -22,7 +22,9 @@ jobs:
 
       - name: Setup SSH
         run: |
-          echo "GIT_SSH_COMMAND=ssh -p 554 -i /root/.ssh/forgejo_runner -o StrictHostKeyChecking=no" >> "$GITHUB_ENV"
+          test -r /keys/forgejo_runner || { echo "Deploy key /keys/forgejo_runner chybi"; exit 1; }
+          install -m 600 /keys/forgejo_runner /tmp/forgejo_runner
+          echo "GIT_SSH_COMMAND=ssh -p 554 -i /tmp/forgejo_runner -o IdentitiesOnly=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=ERROR" >> "$GITHUB_ENV"
 
       - name: Checkout source
         run: |