documentation: added build and install for alpine, with openrc service

documentation/alpine-linux.md

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+# Build ezidam on Alpine Linux
+
+
+## Setup
+Install alpine.
+
+Enable `community` repository in `/etc/apk/repositories`
+
+Install packages:
+```sh
+apk add rustup git build-base
+```
+
+Run `rustup-init` to download the rust compiler.
+
+## Build
+Get code, get in repo
+
+```sh
+rm rust-toolchain.toml
+cargo build --release
+```
+
+## Copy
+
+Create folders for config, assets, database
+
+```sh
+mkdir -p /etc/ezidam /usr/share/ezidam /var/lib/ezidam
+```
+
+Copy binary, config, assets
+```sh
+
+cp target/release/ezidam /usr/bin/ezidam
+cp crates/ezidam/ezidam.toml /etc/ezidam/ezidam.toml
+cp crates/ezidam/static/ crates/ezidam/templates/ /usr/share/ezidam/ -rv
+```
+
+## Config
+
+Here's the paths to use in `/etc/ezidam/ezidam.toml`:
+
+```toml
+[default]
+template_dir = "/usr/share/ezidam/templates"
+static_dir = "/usr/share/ezidam/static"
+
+[default.databases.ezidam]
+url = "/var/lib/ezidam/ezidam.sqlite"
+```
+Don't forget the rest of the config! The above is only a snippet!
+
+## Service
+
+Copy the script `openrc.sh` as `/etc/init.d/ezidam`, then
+```sh
+chmod +x /etc/init.d/ezidam
+```
+
+## Start/Stop/Boot
+
+- Start: `rc-service ezidam start`
+- Stop: `rc-service ezidam stop`
+
+- Start at boot: `rc-update add ezidam`
+- Don't start at boot: `rc-update del ezidam`
+
+## Logs
+
+If ezidam is started with the service, logs will be available at `/var/log/ezidam.{log,err}`

documentation/openrc.sh

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+#!/sbin/openrc-run
+
+name="ezidam"
+command="/usr/bin/ezidam"
+command_args=
+command_background=true
+pidfile="/run/${RC_SVCNAME}.pid"
+output_log="/var/log/${RC_SVCNAME}.log"
+error_log="/var/log/${RC_SVCNAME}.err"
+
+depend() {
+  need net
+  use logger
+}
+
+export EZIDAM_CONFIG="/etc/ezidam/ezidam.toml"