refactor: switch to Foundry

refactor: bump "version" to 3
refactor: delete Hardhat and its Node.js paraphernalia
refactor: import specific symbols instead of global levels
refactor: move custom errors in "IPRBProxy" interface
refactor: move contracts to "src" folder
refactor: rename "PRBProxy__ExecutionNotAuthorized" to "PRBProxy__ExecutionUnauthorized"
refactor: rename "PRBProxy__TargetInvalid" to "PRBProxy__TargetNotContract"

build: add forge-std and prb-test dev dependencies
build: upgrade to Solidity v0.8.17
build: upgrade to Yarn v3.3.0
ci: delete deployment workflows (temporarily)
ci: refactor ci workflow to use Foundry
chore: delete ".czrc" file
chore: delete Hardhat tasks
chore: explain why we're using unchecked arithmetic for seed increment
chore: pass "files" as string in Prettier config
chore: remove "endOfLine" rule in Prettier config
chore: simplify scripts by removing paths to config files
chore: surround values with double quotes in Yaml files
chore: update config and ignore files for Foundry environment
chore: update "package.json" for Foundry environment
chore: use "yml" extension for lint-staged config
ci: rename workflow name to "CI"
style: add "proseWrap" rule in Prettier config
style: add "useTabs" rule in Prettier config
style: emboss header separators
style: disable "contract-name-camelcase" in Solhint config
style: remove "endOfLine" rule in Prettier config
test: add "echoUint256Array" function in "TargetEcho"
test: add "revertWithNothing" in "TargetRevert"
test: add Solidity tests (WIP)
test: delete Node.js tests (WIP)
test: remove NatSpec in testing target contracts
test: rename "echoArray" to "echoBytesArray" in "TargetEcho"
test: set "UNLICENSED" SDPX identifier in test contracts

.editorconfig

@@ -1,4 +1,4 @@
-# EditorConfig  http://EditorConfig.org
+# EditorConfig http://EditorConfig.org
 
 # top-most EditorConfig file
 root = true
@@ -14,3 +14,6 @@ trim_trailing_whitespace = true
 
 [*.sol]
 indent_size = 4
+
+[*.tree]
+indent_size = 1

.env.example

@@ -1,10 +1,2 @@
-ETHERSCAN_API_KEY="etherscan api key"
-INFURA_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
-MNEMONIC="here is where your twelve words mnemonic should be put my friend"
-
-# Block explorer API keys
-BSCSCAN_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
-ETHERSCAN_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
-FTMSCAN_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
-POLYGONSCAN_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
-SNOWTRACE_API_KEY="zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
+export ETH_FROM="YOUR_DEFAULT_SENDER_ACCOUNT"
+export ETH_RPC_URL="https://rinkeby.infura.io/v3/INFURA_API_KEY"

.github/workflows/ci.yml

@@ -0,0 +1,61 @@
+name: "CI"
+
+env:
+  FOUNDRY_PROFILE: "ci"
+
+on:
+  pull_request:
+    branches:
+      - "main"
+      - "staging"
+  push:
+    branches:
+      - "main"
+      - "staging"
+
+jobs:
+  ci:
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "Check out the repo"
+        uses: "actions/checkout@v3"
+        with:
+          submodules: "recursive"
+
+      - name: "Install Foundry"
+        uses: "onbjerg/foundry-toolchain@v1"
+        with:
+          version: "nightly"
+
+      - name: "Install Node.js"
+        uses: "actions/setup-node@v3"
+        with:
+          cache: "yarn"
+          node-version: "lts/*"
+
+      - name: "Install the Node.js dependencies"
+        run: "yarn install --immutable"
+
+      - name: "Lint the contracts"
+        run: "yarn lint"
+
+      - name: "Add lint summary"
+        run: |
+          echo "## Lint" >> $GITHUB_STEP_SUMMARY
+          echo "✅ Passed" >> $GITHUB_STEP_SUMMARY
+
+      - name: "Show the Foundry config"
+        run: "forge config"
+
+      - name: "Run the tests"
+        run: "forge test"
+
+      - name: "Build the contracts"
+        run: |
+          forge --version
+          forge build --sizes
+
+      - name: "Add test summary"
+        run: |
+          echo "## Tests" >> $GITHUB_STEP_SUMMARY
+          echo "✅ Passed" >> $GITHUB_STEP_SUMMARY