Add container simulation with PostgreSQL and SQLite support

apps/container/src/env.rs

@@ -0,0 +1,36 @@
+use std::io::Write;
+
+use shared::db_type::DBType;
+
+#[derive(Clone, Copy)]
+pub enum EnvFileType {
+    DotEnv,
+    Yaml,
+}
+
+#[derive(Clone)]
+pub struct EnvFile {
+    pub file_type: EnvFileType,
+    pub db_type: DBType,
+    pub db_url: String,
+}
+
+impl EnvFile {
+    pub fn write(self, path: impl AsRef<std::path::Path>) {
+        let path_ref = path.as_ref();
+        println!("Config file path: {}", path_ref.display());
+        let mut config_file =
+            std::fs::File::create(path_ref).expect("Failed to create config file");
+        //
+        self._write_line(&mut config_file, "DB_TYPE", &self.db_type.to_string());
+        self._write_line(&mut config_file, "DATABASE_URL", &self.db_url.to_string())
+    }
+
+    fn _write_line(&self, file: &mut std::fs::File, key: &str, value: &str) {
+        match self.file_type {
+            EnvFileType::DotEnv => writeln!(file, "{}={}", key, value),
+            EnvFileType::Yaml => writeln!(file, "{}: \"{}\"", key, value),
+        }
+        .expect("Failed to write to config file");
+    }
+}