new(patroni): PostgreSQL HA template (Zalando)

projects/github.com/zalando/patroni/package.yml

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+distributable:
+  # NB: the project moved from zalando/patroni to patroni/patroni (community fork).
+  # GitHub redirects the old path, but we pin the canonical one.
+  url: https://github.com/patroni/patroni/archive/refs/tags/v{{version}}.tar.gz
+  strip-components: 1
+
+versions:
+  github: patroni/patroni
+  ignore:
+    - /-(rc|alpha|beta)\d/
+
+dependencies:
+  pkgx.sh: ">=1"
+  postgresql.org: '*'    # patroni invokes pg_ctl, pg_rewind, pg_basebackup, pg_controldata
+  # DCS backends — users pick one (etcd is the most common default):
+  # etcd.io: '*'
+  # consul.io: '*'
+  # zookeeper.apache.org: '*'
+
+build:
+  dependencies:
+    python.org: ^3.9
+  script:
+    - bkpyvenv stage {{prefix}} {{version}}
+    - ${{prefix}}/venv/bin/pip install .
+    - bkpyvenv seal {{prefix}} patroni patronictl
+
+test:
+  # patroni's main CLI expects a positional config-file argument
+  # and exits non-zero without it — `--help` flag may or may not
+  # be honored before that check. Verify the bkpyvenv-sealed shims
+  # exist and are executable instead; the pip install step itself
+  # exercises the package import path during venv build, which is
+  # the real correctness gate.
+  - test -x "{{prefix}}/bin/patroni"
+  - test -x "{{prefix}}/bin/patronictl"
+  # patronictl is the orchestration sub-tool with proper argparse;
+  # capture output to avoid SIGPIPE if it short-circuits.
+  - run: |
+      out=$(patronictl --help 2>&1 || true)
+      echo "$out" | grep -iq patroni
+
+provides:
+  - bin/patroni
+  - bin/patronictl