Description:

The nebula upstream project ships a systemd service file that is not included as part of the installation. It can't be since it expects the binaries to be in /usr/local/bin. I am unsure whether it'd be preferred to use sed or a patch to adjust the existing service file or to just ship a custom service file.

A possible patch file to fix the service file is:
```
diff --git a/examples/service_scripts/nebula.service b/examples/service_scripts/nebula.service
index 13c5ff2..67372a9 100644
--- a/examples/service_scripts/nebula.service
+++ b/examples/service_scripts/nebula.service
@@ -8,7 +8,7 @@ SyslogIdentifier=nebula
StandardOutput=syslog
StandardError=syslog
ExecReload=/bin/kill -HUP $MAINPID
-ExecStart=/usr/local/bin/nebula -config /etc/nebula/config.yml
+ExecStart=/usr/bin/nebula -config /etc/nebula/config.yml
Restart=always

[Install]

```

And a patch to the PKGBUILD could be:

```
diff --git a/trunk/PKGBUILD b/trunk/PKGBUILD
index 18ce5e9..f3412e9 100644
--- a/trunk/PKGBUILD
+++ b/trunk/PKGBUILD
@@ -8,8 +8,14 @@ url='https://github.com/slackhq/nebula'
license=('MIT')
depends=()
makedepends=('go-pie')
-source=("${pkgname}-${pkgver}.tar.gz::${url}/archive/v${pkgver}.tar.gz")
-sha256sums=('e0585ef37fae1f8db18cdea20648d4087e586b20ff0961ab7eac59a6c9bdafa2')
+source=("${pkgname}-${pkgver}.tar.gz::${url}/archive/v${pkgver}.tar.gz" "service.patch")
+sha256sums=('e0585ef37fae1f8db18cdea20648d4087e586b20ff0961ab7eac59a6c9bdafa2'
+ '3171c15df90d9e550bee60601132810c40843f01dbfdcd9836fee3bbe3d26e3b')
+
+prepare() {
+ cd "${pkgname}-${pkgver}"
+ patch --forward --strip=1 --input="${srcdir}/service.patch"
+}

build() {
cd "${pkgname}-${pkgver}"
@@ -37,4 +43,5 @@ package() {
install -Dm644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
install -Dm755 nebula "${pkgdir}/usr/bin/nebula"
install -Dm755 nebula-cert "${pkgdir}/usr/bin/nebula-cert"
+ install -Dm644 examples/service_scripts/nebula.service "${pkgdir}/usr/lib/systemd/system/nebula.service"
}
```

Steps to reproduce:
1. Install package
2. `systemctl enable --now nebula.service`