Enable alpine base image compatibility

root/etc/s6-overlay/s6-rc.d/init-mod-jellyfin-rffmpeg-add-package/run

@@ -1,10 +1,24 @@
 #!/usr/bin/with-contenv bash
 
-for package in iputils-ping openssh-client python3-click python3-yaml wakeonlan; do
-    if ! dpkg -s "${package}" >/dev/null 2>&1; then
-        PACKAGES="${package} ${PACKAGES}"
+## Ubuntu
+if [ -f /usr/bin/apt ]; then
+    for package in iputils-ping openssh-client python3-click python3-yaml python3 wakeonlan; do
+        if ! dpkg -s "${package}" >/dev/null 2>&1; then
+            PACKAGES="${package} ${PACKAGES}"
+        fi
+    done
+fi
+# Alpine
+if [ -f /sbin/apk ]; then
+    if ! grep -qxF '@testing https://dl-cdn.alpinelinux.org/alpine/edge/testing' /etc/apk/repositories; then
+        echo @testing https://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories
     fi
-done
+    for package in openssh py3-click py3-yaml python3 wol@testing; do
+        if ! apk info -e "${package}" >/dev/null 2>&1; then
+            PACKAGES="${package} ${PACKAGES}"
+        fi
+    done
+fi
 
 if [ -n "${PACKAGES}" ]; then
     echo "${PACKAGES}" >> /mod-repo-packages-to-install.list