Move slurm to pkgs/slurm

pkgs/slurm/default.nix

@@ -0,0 +1,20 @@
+{ slurm }:
+
+slurm.overrideAttrs (old: {
+  patches = (old.patches or []) ++ [
+    # See https://bugs.schedmd.com/show_bug.cgi?id=19324
+    ./slurm-rank-expansion.patch
+  ];
+  # Install also the pam_slurm_adopt library to restrict users from accessing
+  # nodes with no job allocated.
+  postBuild = (old.postBuild or "") + ''
+    pushd contribs/pam_slurm_adopt
+      make "PAM_DIR=$out/lib/security"
+    popd
+  '';
+  postInstall = (old.postInstall or "") + ''
+    pushd contribs/pam_slurm_adopt
+      make "PAM_DIR=$out/lib/security" install
+    popd
+  '';
+}