dovecot_pigeonhole: patch regarding permission error

This patch fixes a permission issue that occurs when saving compiled
sieve scripts sourced from the nix store. Instead of reusing the
read-only permission bits from the nix store, it explicitly uses `0700`
for the directory in which compiled sieve scripts should be saved.

Additional context:
- NixOS#388463 (comment)
- dovecot/pigeonhole#15

Author: Jappie3

pkgs/by-name/do/dovecot/generic.nix

@@ -48,6 +48,7 @@
   patches ? [ ],
   # Re-exported plugins for this version
   dovecot_pigeonhole,
+  dovecot_exporter,
 }:
 stdenv.mkDerivation {
   pname = "dovecot";
@@ -217,5 +218,6 @@ stdenv.mkDerivation {
     };
 
     pigeonhole = dovecot_pigeonhole;
+    exporter = dovecot_exporter;
   };
 }

pkgs/by-name/do/dovecot_pigeonhole/generic.nix

@@ -9,6 +9,7 @@
   url,
   version,
   hash,
+  patches ? [ ],
   dovecot,
 }:
 stdenv.mkDerivation rec {

pkgs/by-name/do/dovecot_pigeonhole/package.nix

@@ -1,6 +1,7 @@
 {
   lib,
   callPackage,
+  fetchpatch,
   dovecot,
 }:
 let
@@ -49,6 +50,12 @@ callPackage ./generic.nix { } rec {
   url = "https://pigeonhole.dovecot.org/releases/${lib.versions.majorMinor dovecot.version}/dovecot-pigeonhole-${version}.tar.gz";
   version = "2.4.0";
   hash = "sha256-DtCK4WOsOalEcgD7tC17OwXTXpHZmBjdD0r9etHbx1M=";
+  patches = [
+    (fetchpatch {
+      url = "https://patch-diff.githubusercontent.com/raw/dovecot/pigeonhole/pull/15.patch";
+      sha256 = "sha256-BLBz9ZhOGEIIitnXG0uM6bZBRNnQBy4K2IJlh1+Un50=";
+    })
+  ];
 
   inherit dovecot;
 }