ci: debug Host key verification failed error

.drone.yml

@@ -34,13 +34,13 @@ steps:
       - mkdir $$HOME/.ssh && chmod 700 $$HOME/.ssh
       - echo "$$PRIVATE_SSH_KEY" > $$HOME/.ssh/id_ed25519 && chmod 600 $$HOME/.ssh/id_ed25519
       - echo "$$SSH_HOST_KEY" > $$HOME/.ssh/known_hosts
-      - export $$SSHOPTS
+      - export SSHOPTS="$$SSHOPTS"
       - echo DEBUG env
       - env
       - echo DEBUG ls -alh $$HOME/.ssh
       - ls -alh $$HOME/.ssh
       - "echo DEBUG: Using NIX_FLAGS: $$NIX_FLAGS"
-      - nix $$NIX_FLAGS develop --command deploy --magic-rollback false --skip-checks --targets '.#host_001_momo_koeln' --ssh-opts="$SSHOPTS"
+      - nix $$NIX_FLAGS develop --command deploy --magic-rollback false --skip-checks --targets '.#host_001_momo_koeln' --ssh-opts="$$SSHOPTS"
 
 ---
 kind: pipeline
@@ -166,6 +166,6 @@ volumes:
 
 ---
 kind: signature
-hmac: 8a69d4de3b049877a17f6a6f5a336943057139472028343283d3e570760e8bcd
+hmac: bab6b28f9246366499ef7914aa84c8868321565330a8923b893f786e6c0db203
 
 ...