feat: add compose exec and compose bash commands

Exec is new command scoped under compose. It allows sending commands
directly into appserver container. I will make this
customizable/controllable in the future.

src/scripts/docker_compose.rs

@@ -11,6 +11,13 @@ pub fn down() -> Result<()> {
     CommandBuilder::docker_compose().args("down").exec()
 }
 
+pub fn exec(rest: &[String]) -> Result<()> {
+    CommandBuilder::docker_compose()
+        .args("exec appserver")
+        .args(rest)
+        .exec()
+}
+
 /// Start containers via `docker compose start`. Optionally pass containers to be started.
 /// ```
 /// start(None);
@@ -31,6 +38,10 @@ pub fn up() -> Result<()> {
 }
 
 // shortcuts
+pub fn bash() -> Result<()> {
+    exec(&["bash".to_string()])
+}
+
 pub fn rebuild() -> Result<()> {
     stop()?;
     build()?;