enable build caching (#644)

Author: jakeloo

.github/workflows/main.yml

@@ -39,6 +39,8 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           tags: thirdweb/engine:nightly
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           build-args: |
             ENGINE_VERSION=nightly
 

.github/workflows/tagBasedImageBuild.yml

@@ -40,6 +40,8 @@ jobs:
           target: prod
           platforms: linux/amd64,linux/arm64
           push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           tags: |
             thirdweb/engine:${{ github.event.release.tag_name }}
             ${{ env.LATEST_TAG }}