deploy: add troubleshooting information

Signed-off-by: Vitaliy Potyarkin <v.potyarkin@yadro.com>

.forgejo/workflows/build.yml

@@ -33,6 +33,7 @@ jobs:
       - name: Fake DNS name for development # TODO: remove this step after switching DNS records
         run: |
           echo '185.73.212.7 frostfs.info' >> /etc/hosts
+          curl -v --head frostfs.info
 
       - name: Setup SSH environment
         # TODO: add deploy conditions
@@ -49,7 +50,10 @@ jobs:
           ssh-add ~/.ssh/key
           rm ~/.ssh/key
 
-      - run: make deploy
+      - name: make deploy
+        run: |
+          ssh-add -L
+          make deploy
         # TODO: add deploy conditions
         env:
           SSH_AUTH_SOCK: /tmp/ssh_agent.socket