Adds gofmt checker action to GitHub workflow (#6132)

* adds gofmt checker action to GitHub workflow
* gofmt applied

.github/actions/gofmt/Dockerfile

@@ -0,0 +1,5 @@
+FROM cytopia/gofmt
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/gofmt/action.yml

@@ -0,0 +1,12 @@
+name: 'Gofmt checker'
+description: 'Checks that all project files have been properly formatted.'
+inputs:
+  path:
+    description: 'Path to check'
+    required: true
+    default: './'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.path }}

.github/actions/gofmt/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh -l
+set -e
+
+cd $GITHUB_WORKSPACE
+
+# Check if any files are not formatted.
+nonformatted="$(gofmt -l $1 2>&1)"
+
+# Return if `go fmt` passes.
+[ -z "$nonformatted" ] && exit 0
+
+# Notify of issues with formatting.
+echo "Following files need to be properly formatted:"
+echo "$nonformatted"
+exit 1

.github/workflows/go.yml

@@ -8,11 +8,23 @@ on:
 
 jobs:
 
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Gofmt checker
+        id: gofmt
+        uses: ./.github/actions/gofmt
+        with:
+          path: ./
+
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
-
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:

beacon-chain/powchain/service_test.go

@@ -14,13 +14,13 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
 	"github.com/ethereum/go-ethereum/common"
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
-	logTest "github.com/sirupsen/logrus/hooks/test"
 	dbutil "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	mockPOW "github.com/prysmaticlabs/prysm/beacon-chain/powchain/testing"
 	contracts "github.com/prysmaticlabs/prysm/contracts/deposit-contract"
 	protodb "github.com/prysmaticlabs/prysm/proto/beacon/db"
 	"github.com/prysmaticlabs/prysm/shared/event"
 	"github.com/prysmaticlabs/prysm/shared/testutil"
+	logTest "github.com/sirupsen/logrus/hooks/test"
 )
 
 var _ = ChainStartFetcher(&Service{})