ci: add upload artifacts step

.drone.yml

@@ -43,9 +43,9 @@ steps:
     commands:
       - export TARGET_DIR="$${DRONE_REPO}/$${DRONE_BUILD_NUMBER}"
       - echo env var TARGET_DIR is set to $$TARGET_DIR
-      - env | grep HOME
       - "mkdir ~/.ssh && chmod 700 ~/.ssh"
       - "echo $$PRIVATE_SSH_KEY > ~/.ssh/id_ed25519 && chmod 600 ~/.ssh/id_ed25519"
+      - ssh-add ~/.ssh/id_ed25519
       - nix flake new --template "git+https://git.greenbaum.cloud/dev/tritonshell?ref=main" ./tritonshell
       - git add tritonshell
       - cd tritonshell
@@ -110,6 +110,6 @@ volumes:
 
 ---
 kind: signature
-hmac: 9229e61bbc27bc0f8038a004c8b7b8ebcc2bfe1b8e709942313178ab9ad3c3a9
+hmac: fc80339f6bf301786d9d36c4abc7960a8bb457a7c4d0c48461132f76faa80978
 
 ...