drone: add --accept-flake-config flag

.drone.yml

@@ -11,7 +11,7 @@ steps:
       event:
         - pull_request
     environment:
-      NIX_FLAGS: "--print-build-logs --verbose"
+      NIX_FLAGS: "--print-build-logs --verbose --accept-flake-config"
     commands:
       - 'echo DEBUG: Using NIX_FLAGS: $NIX_FLAGS'
       - nix $$NIX_FLAGS develop --command nix flake show
@@ -27,7 +27,7 @@ node:
 steps:
   - name: "Tests"
     environment:
-      NIX_FLAGS: "--print-build-logs --verbose"
+      NIX_FLAGS: "--print-build-logs --verbose --accept-flake-config"
     commands:
       - 'echo DEBUG: Using NIX_FLAGS: $NIX_FLAGS'
       - nix $$NIX_FLAGS build ".#checks.x86_64-linux.customTestFor-PubSolarOS-firstTest"
@@ -93,7 +93,7 @@ steps:
   - name: "Build ISO"
     image: docker.nix-community.org/nixpkgs/nix-flakes:latest
     environment:
-      NIX_FLAGS: "--print-build-logs --verbose"
+      NIX_FLAGS: "--print-build-logs --verbose --accept-flake-config"
     volumes:
       - name: file-exchange
         path: /var/nix/iso-cache
@@ -148,6 +148,6 @@ volumes:
 
 ---
 kind: signature
-hmac: 291be33bbf2954d1f5e4bf569679e24a773e7d6f90db4765fb9dacb3686a825e
+hmac: f388f4c8d7722725140a201f8f86dd9baa480e66d495d2ad26e075ae1c2012db
 
 ...