Created Installation on Alpine Linux (markdown)

Installation-on-Alpine-Linux.md

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+Here you can find instruction to install Jackett on Alpine Linux.
+
+```
+# requirements on alpine/musl:
+apk add --no-cache sqlite-libs gcompat bash icu-libs krb5-libs libgcc libintl libssl1.1 libstdc++ zlib
+
+# Extract Musl build to /opt:
+cd /opt
+tar -C . -xvf "Jackett.Binaries.LinuxMuslAMDx64.tar.gz"
+rm "Jackett.Binaries.LinuxMuslAMDx64.tar.gz"
+
+# setup user and group
+addgroup -S jackett
+adduser -S -D -h /opt/JackettData -s /sbin/nologin jackett -G jackett
+addgroup -S media && addgroup -S jackett media
+
+# setup permissions
+chown -R jackett:jackett /opt/Jackett
+chown -R jackett:jackett /opt/JackettData
+
+# create openrc service
+tee /etc/init.d/jackett <<EOF
+#!/sbin/openrc-run
+
+command="/opt/Jackett/jackett"
+command_args="--NoRestart"
+command_user="jackett:jackett"
+command_background=true
+
+name="\${RC_SVCNAME}"
+basedir="/opt/Jackett"
+datadir="/opt/JackettData"
+
+start_stop_daemon_args="--chdir \${basedir}"
+pidfile="/run/\${RC_SVCNAME}.pid"  
+
+depend() {
+  after network-online
+  use network-online 
+}
+
+stop_pre() {
+  # from jackett_launcher.sh
+  while pgrep -u "\$(whoami)" JackettUpdater > /dev/null; do
+    sleep 1
+  done
+}
+
+start_pre() {
+  checkpath -q -d -m 0777 -o "\${command_user}" \\
+  \${basedir} \\
+  \${datadir}
+  export XDG_CONFIG_HOME=\${datadir}
+  rm -f "\${datadir}/\${RC_SVCNAME}.pid"
+}
+EOF
+
+chmod +x /etc/init.d/jackett
+
+# add service to autostart
+rc-update add jackett default
+rc-service jackett start
+
+# debugging
+rc-service jackett status
+cat /var/log/messages
+cat /opt/JackettData/Jackett/log.txt
+```