ci: checkout code before git diff check (#4779)

.github/workflows/tests.yml

@@ -19,6 +19,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v2
       - uses: technote-space/get-diff-action@v1
         with:
           SUFFIX_FILTER: |
@@ -30,7 +31,6 @@ jobs:
       - name: Set GOBIN
         run: |
           echo "::add-path::$(go env GOPATH)/bin"
-      - uses: actions/checkout@v2
       - name: install
         run: make install install_abci
         if: "env.GIT_DIFF != ''"
@@ -45,6 +45,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: Build
     steps:
+      - uses: actions/checkout@v2
       - uses: technote-space/get-diff-action@v1
         with:
           SUFFIX_FILTER: |
@@ -56,7 +57,6 @@ jobs:
       - name: Set GOBIN
         run: |
           echo "::add-path::$(go env GOPATH)/bin"
-      - uses: actions/checkout@v2
       - uses: actions/cache@v1
         with:
           path: ~/go/bin
@@ -71,6 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: Build
     steps:
+      - uses: actions/checkout@v2
       - uses: technote-space/get-diff-action@v1
         with:
           SUFFIX_FILTER: |
@@ -82,7 +83,6 @@ jobs:
       - name: Set GOBIN
         run: |
           echo "::add-path::$(go env GOPATH)/bin"
-      - uses: actions/checkout@v2
       - uses: actions/cache@v1
         with:
           path: ~/go/bin