fix github actions workflow

Author: zhangzujian

.github/workflows/build-x86-image.yaml

@@ -172,7 +172,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries
@@ -207,7 +207,7 @@ jobs:
       - name: Run E2E
         working-directory: ${{ env.E2E_DIR }}
         env:
-          E2E_BRANCH: ${{ matrix.branch }}
+          E2E_BRANCH: ${{ github.base_ref || github.ref_name }}
           E2E_IP_FAMILY: ${{ matrix.ip-family }}
           E2E_NETWORK_MODE: ${{ matrix.mode }}
         run: make k8s-conformance-e2e
@@ -265,7 +265,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries
@@ -414,7 +414,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries
@@ -495,7 +495,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries
@@ -764,7 +764,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries
@@ -857,7 +857,7 @@ jobs:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles('${{ env.E2E_DIR }}/**/go.sum') }}
+          key: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-${{ hashFiles(format('{0}/**/go.sum', env.E2E_DIR)) }}
           restore-keys: ${{ runner.os }}-e2e-${{ env.GO_FULL_VER }}-x86-
 
       - name: Build e2e binaries