WIP: Create script to deploy in CI

packages/auto-deploy-vms/default.nix

@@ -0,0 +1,46 @@
+{
+  deploy-rs,
+  gitMinimal,
+  writeShellApplication,
+  ...
+}:
+writeShellApplication {
+  name = "qois-auto-deploy-vms";
+  meta.description = "Deploy VMs automatically as part of CI process.";
+  runtimeInputs = [
+    deploy-rs
+    gitMinimal
+  ];
+  text = ''
+    set -x
+    FLAKE_ROOT="$(git rev-parse --show-toplevel)"
+    export PROFILE="system-vm"
+    # shellcheck disable=SC2016
+    HOSTS=$(nix eval --raw .#deploy.nodes --apply 'nodes: let
+        names = builtins.attrNames nodes;
+        profile = "$PROFILE";
+        filteredNames = builtins.filter (name: nodes.''${name}.profiles ? ''${profile}) names;
+      in
+      builtins.concatStringsSep "\n" filteredNames')
+
+      retry() {
+          local -r -i max_attempts="$1"; shift
+          local -i attempt_num=1
+          until "$@"
+          do
+              if ((attempt_num==max_attempts))
+              then
+                  echo "Attempt $attempt_num failed and there are no more attempts left!"
+                  return 1
+              else
+                  echo "Attempt $attempt_num failed! Trying again in $attempt_num seconds..."
+                  sleep $((attempt_num++))
+              fi
+          done
+      }
+
+    for HOST in $HOSTS; do
+      retry 3 deploy --skip-checks --targets "$FLAKE_ROOT#''${HOST}.system-vm"
+    done
+  '';
+}