initial nix based docker images

nix/image/php.nix

@@ -0,0 +1,53 @@
+{
+  lib,
+  php,
+  debug ? false,
+}: let
+  inherit (lib) optionals;
+in
+  php.buildEnv {
+    extensions = {
+      enabled,
+      all,
+    }:
+      enabled
+      ++ (with all;
+        [
+          xdebug
+          excimer
+          inotify
+          redis
+          oci8
+          zip
+          pdo
+          pdo_pgsql
+          pdo_sqlite
+          pdo_mysql
+          pgsql
+          intl
+          curl
+          mbstring
+          pcntl
+          ldap
+          exif
+          gmp
+          apcu
+        ]
+        ++ optionals (!debug) [
+          # smbclient # this breaks the build for no apparent reason
+          blackfire
+        ]);
+    extraConfig = ''
+      xdebug.mode=debug,trace,profile
+      xdebug.start_with_request=trigger
+      xdebug.discover_client_host=true
+      xdebug.client_host=hazehost
+      xdebug.log_level=0
+      xdebug.output_dir=/tmp/xdebug
+
+      memory_limit=512M
+
+      apc.enable_cli=1
+      opcache.enable_cli=1
+    '';
+  }