feat: add utilities

utils.nix

@@ -0,0 +1,42 @@
+{...}: {
+  mkUtils = {pkgs, ...}: {
+    commitAndPushFiles = {
+      message,
+      files ? [],
+    }: jobArgs:
+      jobArgs
+      // {
+        before_script = [
+          ''
+            eval "$(ssh-agent -s)" >/dev/null;
+            ssh-keyscan -t rsa $CI_SERVER_HOST >> ~/.ssh/known_hosts;
+            echo "$GIT_SSH_PRIV_KEY" | tr -d '\r' | ssh-add - >/dev/null;
+            git config --global user.email "$GIT_EMAIL" >/dev/null;
+            git config --global user.name "$GIT_NAME" >/dev/null;
+            export CI_PUSH_REPO=`echo $CI_REPOSITORY_URL | sed -e "s|.*@\(.*\)|git@\1|" -e "s|/|:|"`;
+            git remote rm origin && git remote add origin ''${CI_PUSH_REPO}
+          ''
+        ];
+        script =
+          (jobArgs.script or [])
+          ++ (
+            if builtins.length files == 0
+            then []
+            else [
+              ''
+                git add ${builtins.concatStringsSep " " files}
+              ''
+            ]
+          )
+          ++ [
+            ''
+              git diff --cached --exit-code >/dev/null &&
+                echo "Nothing to commit" ||
+                git commit -m "${message}" --no-verify;
+              git push --tags origin ''${GIT_SOURCE_REF:-HEAD}:''${GIT_TARGET_REF:-$CI_COMMIT_REF_NAME} -o ci.skip
+            ''
+          ];
+        deps = (jobArgs.deps or []) ++ [pkgs.openssh pkgs.gitMinimal pkgs.gnused];
+      };
+  };
+}