drone: use our custom drone-scp image

.drone.yml

@@ -108,7 +108,9 @@ steps:
       - nix run nixpkgs#gnused -- --in-place "s/$ISO_NAME/PubSolarOS-latest.iso/" PubSolarOS-latest.iso.sha256
 
   - name: "Publish ISO"
-    image: appleboy/drone-scp
+    # custom drone-scp image, source: https://git.b12f.io/pub-solar/drone-scp/
+    # docker build --tag registry.greenbaum.cloud/library/drone-scp:v1.6.5 --file ./docker/Dockerfile.linux.amd64 .
+    image: registry.greenbaum.cloud/library/drone-scp:v1.6.5
     volumes:
       - name: file-exchange
         path: /var/nix/iso-cache
@@ -125,7 +127,7 @@ steps:
       source:
         - /var/nix/iso-cache/*.iso
         - /var/nix/iso-cache/*.iso.sha256
-      overwrite: true
+      unlink_first: true
       strip_components: 3
 
 depends_on:
@@ -143,6 +145,6 @@ volumes:
 
 ---
 kind: signature
-hmac: 8823c7103f6a075bb291a497c7ab5d5db47a91f9bc7d8ef95329b5620c9cf91d
+hmac: 3e6a89e903e214f21d488eba82863683b130ef6dbc2dc352377d4fd94ab3cd0c
 
 ...