feat: cache RPC responses

build: add "@actions/cache" and "@actions/github" as deps
build: add "prettier" as dev dep
build: regenerate "dist" files
chore: add Prettier configuration and Prettier ignore file
docs: change author to "Foundry"
feat: run "save" function on post
style: format JavaScript files with Prettier

.prettierignore

@@ -0,0 +1,2 @@
+dist
+node_modules

.prettierrc.yml

@@ -0,0 +1,7 @@
+bracketSpacing: true
+printWidth: 120
+proseWrap: "always"
+singleQuote: false
+tabWidth: 2
+trailingComma: "all"
+useTabs: false

README.md

@@ -34,6 +34,23 @@ jobs:
 | --------- | ------------ | ----------- | ------------------------------------------------------------------------------------------------------------ | -------- |
 | `version` | No           | `nightly`   | Version to install, e.g. `nightly` or `1.0.0`. **Note:** Foundry only has nightly builds for the time being. | string   |
 
+### RPC Caching
+
+This action matches Forge's behavior and caches all RPC responses in the `~/.foundry/cache/rpc` directory. This is done to
+speed up the tests and avoid hitting the rate limit of your RPC provider.
+
+The logic of the caching is as follows:
+
+- Always load the latest valid cache, and always create a new one with the updated cache.
+- When there are no changes to the fork tests, the cache does not change but the restore key does, since the key is based on the commit hash.
+- When the fork tests are changed, both the cache and the store key are updated.
+
+#### Fuzzing
+
+Note that if you are fuzzing in your fork tests, the RPC cache strategy above will not work unless you set a
+[fuzz seed](https://book.getfoundry.sh/reference/config/testing#seed). You might also want to reduce your number
+of RPC calls by using [Multicall](https://github.com/mds1/multicall).
+
 ### Summaries
 
 You can add the output of Forge and Cast commands to GitHub step summaries. The summaries support GitHub flavored Markdown.

action.yml

@@ -1,10 +1,10 @@
 name: "foundry-toolchain"
 description: "Install Foundry"
-author: "Oliver Nordbjerg"
+author: "Foundry"
 branding:
   color: "gray-dark"
   icon: "play-circle"
-  
+
 inputs:
   version:
     default: "nightly"
@@ -18,3 +18,5 @@ inputs:
 runs:
   using: "node16"
   main: "dist/index.js"
+  post: "dist/save/index.js"
+  post-if: "success()"