chore: CI updates for renamed module

Linter:
- Block imports of `ethereum/go-ethereum` upstream module
- Disable `goimports` checks on upstream code

Go:
- Update flaky-test regex
- Run flaky and non-flaky tests in different steps as this makes it easier to spot incorrect regex

Upstream delta:
- Use env var in workflow instead of `libevm-base` tag -> base changes atomically with the update commit

.github/workflows/go.yml

@@ -9,6 +9,8 @@ on:
 
 jobs:
   go_test_short:
+    env:
+      FLAKY_REGEX: 'ava-labs/libevm/(eth|eth/tracers/js|eth/tracers/logger|accounts/abi/bind|accounts/keystore|eth/downloader|miner|ethclient|ethclient/gethclient|eth/catalyst)$'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -16,8 +18,9 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: 1.21.4
-      - name: Run tests
+      - name: Run flaky tests sequentially
         run: | # Upstream flakes are race conditions exacerbated by concurrent tests
-          FLAKY_REGEX='go-ethereum/(eth|eth/tracers/js|eth/tracers/logger|accounts/abi/bind|accounts/keystore|eth/downloader|miner|ethclient|ethclient/gethclient|eth/catalyst)$';
           go list ./... | grep -P "${FLAKY_REGEX}" | xargs -n 1 go test -short;
+      - name: Run non-flaky tests concurrently
+        run: |
           go test -short $(go list ./... | grep -Pv "${FLAKY_REGEX}");

.github/workflows/libevm-delta.yml

@@ -9,6 +9,9 @@ on:
 
 jobs:
   diffs:
+    env:
+      # Last commit on `renamed-go-module` branch to be merged into `main`
+      LIBEVM_BASE: a7f08d0e757d5a69d3e269c69dcea7e45bab97e3
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -21,19 +24,19 @@ jobs:
           git config color.diff.old "#DC3220";
           git config color.diff.new "#005AB5";
 
-      - name: git diff libevm-base
+      - name: git diff {LIBEVM_BASE}
         run: |
           git diff --diff-filter=a --word-diff --unified=0 --color=always \
-            libevm-base \
+            "${LIBEVM_BASE}" \
             ':(exclude).golangci.yml' \
             ':(exclude).github/**' \
             ':(exclude)README.md';
       
-      - name: git diff libevm-base..main
+      - name: git diff {LIBEVM_BASE}..main
         run: |
           git checkout main --;
           git diff --diff-filter=a --word-diff --unified=0 --color=always \
-            libevm-base \
+            "${LIBEVM_BASE}" \
             ':(exclude).golangci.yml' \
             ':(exclude).github/**' \
             ':(exclude)README.md';

.golangci.yml

@@ -61,13 +61,14 @@ linters-settings:
   gomodguard:
     blocked:
       modules:
+        - github.com/ethereum/go-ethereum:
         - github.com/ava-labs/avalanchego:
         - github.com/ava-labs/coreth:
         - github.com/ava-labs/subnet-evm:
   revive:
     rules:
       - name: unused-parameter
-        # Method parameters may be equired by interfaces and forcing them to be
+        # Method parameters may be required by interfaces and forcing them to be
         # named _ is of questionable benefit.
         disabled: true
 
@@ -84,6 +85,7 @@ issues:
         - gci
         - gofmt
         - goheader
+        - goimports
         - gosec
         - gosimple
         - govet