chore: add dispatch trigger

.github/workflows/docker.yml

@@ -1,6 +1,7 @@
 name: Build docker image
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - 'main'

.github/workflows/rust.yml

@@ -1,6 +1,7 @@
 name: Rust
 
 on:
+  workflow_dispatch:
   push:
     branches: [ main ]
   pull_request: