Fix Docker image used to open a PR to nixpkgs

RELEASE_NOTES.md

@@ -1,5 +1,9 @@
 # Release notes
 
+## New in git-machete 2.15.9
+
+- fixed: Docker image used to open a PR to nixpkgs
+
 ## New in git-machete 2.15.8
 
 - improved: both `master` (or `main`) and `develop` are automatically treated as roots in `discover`

ci/nixpkgs-pr/Dockerfile

@@ -1,25 +1,9 @@
 FROM nixos/nix
 
-RUN nix-env -i bash curl git jq
-
-WORKDIR /root
-RUN set -x \
-    && git clone --depth=1 https://github.com/github/hub.git \
-    && cd /root/hub/ \
-    && nix-env -i go gnumake \
-    && make bin/hub \
-    && nix-env -e go gnumake \
-    && nix-collect-garbage -d \
-    && mkdir -p /usr/local/bin/ \
-    && cp bin/hub /usr/local/bin/ \
-    && cd /root \
-    && rm -r hub/
-ENV PATH=$PATH:/usr/local/bin
-RUN hub --version
-
-RUN mkdir /root/nixpkgs
-WORKDIR /root/nixpkgs
+RUN nix-env -i bash curl git hub jq
 
 COPY pr-description.md entrypoint.sh /root/
 RUN chmod +x /root/entrypoint.sh
 ENTRYPOINT /root/entrypoint.sh
+
+WORKDIR /root/nixpkgs

ci/nixpkgs-pr/build-context/entrypoint.sh

@@ -40,5 +40,5 @@ hub pull-request \
   --head VirtusLab:$branch \
   --message "$message" \
   --labels='10.rebuild-darwin: 1-10,10.rebuild-linux: 1-10,11.by: upstream-developer'
-# Deliberately not setting --reviewer (not needed + caused non-trivial issues with access of personal OAuth token to organization-owned repo:
-# it could create a PR but could not set a reviewer, see https://travis-ci.com/VirtusLab/git-machete/jobs/657256851).
+# Deliberately not setting `--reviewer`, since it's not strictly needed
+# and caused non-trivial issues with access of personal OAuth token to organization-owned repo.

git_machete/__init__.py

@@ -1 +1 @@
-__version__ = '2.15.8'
+__version__ = '2.15.9'