Add init-wpcontent script to fix error if wp-content is empty

Dockerfile

@@ -29,6 +29,10 @@ COPY --from=wp-src ["/usr/src/wordpress/", "/var/www/html/"]
 
 COPY ["patches/${WP_PATCH_VERSION}/wp-admin-update-core.patch", "/etc/wp-mods/"]
 
+# Copy wp-content/themes to src - This is needed if wp-content is mounted as a volume and not initialized prior
+COPY --from=wp-src ["/usr/src/wordpress/wp-content/themes/", "/usr/src/wordpress/wp-content/themes/"]
+
+
 
 # Stage 3 - Final
 FROM ghcr.io/n0rthernl1ghts/wordpress-unit-base:2.1.0
@@ -38,6 +42,7 @@ RUN apk add --update --no-cache patch
 COPY --from=rootfs ["/", "/"]
 
 RUN set -eux \
+    && apk add --update --no-cache rsync \
     && chmod a+x /usr/local/bin/wp \
     && mv "/var/www/html/wp-config-docker.php" "/var/www/html/wp-config.php" \
     && wp-apply-patch "/etc/wp-mods/wp-admin-update-core.patch" "/var/www/html/wp-admin/update-core.php" "true"

rootfs/etc/s6-overlay/s6-rc.d/init-wpcontent/run

@@ -0,0 +1,24 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash
+
+# init-wpcontent main
+main() {
+    # This will prepend service name to all output from here
+    exec > >(while read -r line; do echo "[init-wpcontent] ${line}"; done) 2>&1
+
+    local wpContentDir="/var/www/html/wp-content"
+    local wpThemesDir="${wpContentDir}/themes"
+
+    # If themes directory is empty
+    if [ ! -d "${wpThemesDir}" ] || [ -z "$(ls -A "${wpThemesDir}")" ]; then
+        if [ "${WORDPRESS_INIT_NO_SYNC_THEMES:-false}" = "true" ]; then
+            echo "Warning: Themes directory is empty, but sync is disabled"
+            return
+        fi
+
+        echo "Themes directory is empty, copying default themes"
+        rsync -a --ignore-existing --progress /usr/src/wordpress/wp-content/themes "${wpContentDir}/"
+        return
+    fi
+}
+main

rootfs/etc/s6-overlay/s6-rc.d/init-wpcontent/type

@@ -0,0 +1 @@
+oneshot

rootfs/etc/s6-overlay/s6-rc.d/init-wpcontent/up

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/init-wpcontent/run