[buildbot] docker,worker: install pyelftools

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/b4505aa5a7c4c041c43343a0e1371728c334fc7c

commit b4505aa5a7c4c041c43343a0e1371728c334fc7c
Author: Ben Whitten <BWhitten at users.noreply.github.com>
AuthorDate: Thu Jul 27 21:25:56 2023 +0100

    docker,worker: install pyelftools
    
    UBoot version of at least 2023.07.02 that use binman also have a dependency of pyelftools on the build host.
    
    Signed-off-by: Ben Whitten <BWhitten at users.noreply.github.com>
    Signed-off-by: Petr Štetiar <ynezz at true.cz> [whitespace fix]
---
 docker/buildworker/Dockerfile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docker/buildworker/Dockerfile b/docker/buildworker/Dockerfile
index 09c38ee..6008cdb 100644
--- a/docker/buildworker/Dockerfile
+++ b/docker/buildworker/Dockerfile
@@ -45,6 +45,7 @@ RUN \
 RUN pip3 install -U pip
 RUN pip3 install \
 		"buildbot-worker==$BUILDBOT_VERSION" \
+		pyelftools \
 		pyOpenSSL \
 		service_identity