Initial package for pnpr 0.1.0-alpha.5

Native binary taken from the @pnpm/pnpr.linux-{x64,arm64} npm platform
packages; systemd service with dynamic sysusers pnpr user. Storage in
/var/lib/pnpr, disposable proxy cache split into /var/cache/pnpr via
--cache. Default config proxies registry.npmjs.org; listen address and
extra flags via /etc/pnpr/pnpr.env.

pnpr.yaml

@@ -0,0 +1,54 @@
+# pnpr configuration — https://pnpm.io/pnpr
+#
+# pnpr is EXPERIMENTAL upstream; config keys may change between releases.
+# The listen address and extra CLI flags are set in /etc/pnpr/pnpr.env,
+# the proxy-cache path (/var/cache/pnpr) on the ExecStart line — this
+# file defines storage, registries and (optionally) auth.
+#
+# Point clients at it, e.g. in a project's .npmrc:
+#   registry=http://127.0.0.1:7677/
+# A single registry can also be addressed directly:
+#   registry=http://127.0.0.1:7677/~npmjs/
+#
+# Same-host rootless Podman runners (gitea-runner jobs): loopback is the
+# container's own, and under pasta the host's LAN IP is carried by the
+# container too — see the addressing note in
+# /etc/gitea-runner/cache-server.yaml. Use a host /etc/hosts entry such as
+#   10.88.0.1 host.containers.internal
+# then set PNPR_LISTEN=0.0.0.0:7677 (or the bridge address) plus
+# PNPR_OPTS=--public-url http://host.containers.internal:7677 in
+# /etc/pnpr/pnpr.env, and use that URL in the runners' .npmrc.
+
+# Where hosted (published) packages live. Persistent; the disposable
+# upstream mirror is kept separately under /var/cache/pnpr.
+storage: /var/lib/pnpr
+
+registries:
+  # Caching proxy of the public npm registry.
+  npmjs:
+    type: upstream
+    url: https://registry.npmjs.org/
+    public: true
+
+  # Private hosted registry for own packages — uncomment to enable
+  # publishing (requires auth, see below).
+  #local:
+  #  type: hosted
+  #  packages:
+  #    '@infomaos/*':
+  #      publish: $authenticated
+
+  # What clients see: first match wins across sources.
+  main:
+    type: router
+    sources: [npmjs]
+    #sources: [local, npmjs]
+
+defaultRegistry: main
+
+# htpasswd-backed authentication (needed for publishing to a hosted
+# registry, or to require login for reads on non-public registries).
+#auth:
+#  htpasswd:
+#    file: /var/lib/pnpr/htpasswd
+#    max_users: 1