[bbb-greenlight] Use the patch from local repo

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 1e001fbf8ec9d587498e7d11eaf312c589fd4dab
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Mon Jun 14 15:41:09 2021 +0200

    Use the patch from local repo

 Dockerfile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index c03f0da..101738f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM bigbluebutton/greenlight:v2
+ADD ldap.patch /ldap.patch
 RUN apk add -U patch && \
-    curl 
https://gitlab.gnome.org/Infrastructure/bbb-greenlight/-/commit/513056419db72ca6083a8c44e73eb6a7d2a05025.patch
> ldap.patch && \
-    patch -p1 -i ldap.patch && \
+    patch -p1 -i /ldap.patch && \
     rm -f ldap.patch