fix: pass GITHUB_TOKEN to mise-action and enable install step

Set GITHUB_TOKEN and GITHUB_API_TOKEN on the mise-action step directly
and enable install: true so tools are installed during bootstrap where
the token is available, avoiding rate limits for aqua backend downloads.

Author: MichaelWalker-git

.github/workflows/build.yml

@@ -75,6 +75,11 @@ const project = new awscdk.AwsCdkTypeScriptApp({
       uses: 'jdx/mise-action@v3.6.2',
       with: {
         cache: true,
+        install: true,
+      },
+      env: {
+        GITHUB_TOKEN: '${{ github.token }}',
+        GITHUB_API_TOKEN: '${{ github.token }}',
       },
     },
   ],