chore(ci): check gencodec generated files are up to date

- fix generation of code using type aliases and Go 1.23
- reproducible generation locally (pin gencodec version)
- CI keeps generated Go files up to date with other source code
- Generate missing files

See original PR ava-labs/coreth#856

Author: qdm12

.github/workflows/tests.yml

@@ -57,6 +57,12 @@ jobs:
         run: echo "TIMEOUT=1200s" >> "$GITHUB_ENV"
       - run: go mod download
         shell: bash
+      - name: fjl/gencodec generated files are up to date
+        run: |
+          grep -lr -E '^// Code generated by github\.com\/fjl\/gencodec\. DO NOT EDIT\.$' . | xargs -r rm
+          go generate -run "github.com/fjl/gencodec" ./...
+          git add --intent-to-add --all
+          git diff --exit-code
       - name: Mocks are up to date
         shell: bash
         run: |

cmd/evm/internal/t8ntool/gen_header.go

@@ -28,7 +28,7 @@ import (
 	"github.com/ava-labs/libevm/common/math"
 )
 
-//go:generate go run github.com/fjl/gencodec@a3c3302847cea77ab534228aefa025992dc2c696 -type Account -field-override accountMarshaling -out gen_account.go
+//go:generate go run github.com/fjl/gencodec -type Account -field-override accountMarshaling -out gen_account.go
 
 // Account represents an Ethereum account and its attached data.
 // This type is used to specify accounts in the genesis block state, and

core/gen_genesis.go

@@ -148,7 +148,7 @@ func (h *HeaderSerializable) updateToExtras(extras *HeaderExtra) {
 	extras.BlockGasCost = h.BlockGasCost
 }
 
-//go:generate go run github.com/fjl/gencodec@a3c3302847cea77ab534228aefa025992dc2c696 -type HeaderSerializable -field-override headerMarshaling -out gen_header_serializable_json.go
+//go:generate go run github.com/fjl/gencodec -type HeaderSerializable -field-override headerMarshaling -out gen_header_serializable_json.go
 //go:generate go run github.com/ava-labs/libevm/rlp/rlpgen@739ba847f6f407f63fd6a24175b24e56fea583a1 -type HeaderSerializable -out gen_header_serializable_rlp.go
 
 // HeaderSerializable defines the header of a block in the Ethereum blockchain,