feat: add rpm to goreleaser build

Adds an RPM output to our goreleaser build.

To create a test build of the RPM, run:

```sh
goreleaser-test-release
```

This will create a `dist` directory with release artifacts, including
RPMs for both amd64 and arm64.

To install and use the RPM:

```sh
sudo su -

dnf install -y epel-release dnf
dnf config-manager --set-enabled crb
dnf update -y --allowerasing
dnf install -y https://dnf.pgedge.com/reporpm/pgedge-release-latest.noarch.rpm
dnf install -y \
      pgedge-postgresql18 \
      pgedge-spock50_18 \
      pgedge-snowflake_18 \
      pgedge-lolor_18 \
      pgedge-postgresql18-contrib \
      pgedge-pgbackrest \
      pgedge-python3-psycopg2 \
      python3-pip
pip install 'patroni[etcd,jsonlogger]==4.1.0'

rpm -i <path to rpm file>

systemctl start pgedge-control-plane.service
```

From there, you can interact with it as normal, e.g.:

```sh
curl http://localhost:3000/v1/cluster/init
```

Keep in mind that the host ID will default to the machine's short
hostname.

To tail the control-plane logs, do:

```
journalctl -u pgedge-control-plane.service --follow
```

PLAT-459

Author: jason-lynch

.goreleaser.yaml

@@ -26,6 +26,24 @@ sboms:
     documents:
       - '${artifact}.spdx.json'
 
+nfpms:
+  - package_name: pgedge-control-plane
+    vendor: pgEdge
+    homepage: https://www.pgedge.com
+    maintainer: pgEdge Support <support@pgedge.com>
+    description: pgEdge Control Plane
+    license: PostgreSQL License
+    formats:
+      - rpm
+    bindir: /usr/sbin
+    contents:
+      - src: packaging/pgedge-control-plane.service
+        dst: /usr/lib/systemd/system/pgedge-control-plane.service
+        type: config
+      - src: packaging/config.json
+        dst: /etc/pgedge-control-plane/config.json
+        type: config|noreplace
+
 release:
   github:
     owner: pgEdge

packaging/config.json

@@ -0,0 +1,4 @@
+{
+  "orchestrator": "systemd",
+  "data_dir": "/var/lib/pgedge-control-plane"
+}

packaging/pgedge-control-plane.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=pgEdge Control Plane
+Documentation=https://docs.pgedge.com
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/usr/sbin/pgedge-control-plane run --config-path /etc/pgedge-control-plane/config.json
+Restart=on-failure
+RestartSec=5s
+StateDirectory=pgedge-control-plane
+ConfigurationDirectory=pgedge-control-plane
+
+[Install]
+WantedBy=multi-user.target