Put commands into entrypoint

sbin/dokku-entrypoint.sh

@@ -1,8 +1,43 @@
-#!/bin/sh
+#!/bin/bash
 
-if [ -f "/data/gitea/conf/app.ini" ]; then
-  echo "=====> Running database migration"
-  gitea migrate
-fi
+set -eu -o pipefail
+
+setup_db() {
+    set -eu
+
+    if [ -f "/data/gitea/conf/app.ini" ]; then
+      echo "=====> Running database migration"
+      gitea migrate
+    fi
+}
+
+setup_root_user() {
+    set -eu
+
+    if [ ! -f "/data/gitea/conf/app.ini" ]; then
+      return
+    fi
+
+    user_count=$(sqlite3 /data/gitea/gitea.db "select count(*) from user;")
+
+    if [[ "${user_count}" == "0" ]]; then
+        echo "=====> Setting up root user for initial deployment"
+        if gitea admin createuser username "$ADMIN_USER" password "$ADMIN_PASS" email "$ADMIN_MAIL" admin; then
+            echo "=====> root user added"
+        else
+            echo "=====> Failed to add root user"
+            exit 1
+        fi
+    fi
+}
+
+main() {
+    set -eu
+
+    setup_db
+    setup_root_user
+}
+
+main
 
 /usr/bin/entrypoint "$@"