ci: switch environment to ubuntu-20.04 (#1838)

.github/workflows/build-arm64-image.yaml

@@ -20,7 +20,7 @@ env:
 jobs:
   build:
     name: Build arm64
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Set up Go 1.x
         uses: actions/setup-go@v3

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

@@ -4,7 +4,7 @@ on: workflow_dispatch
 jobs:
   build:
     name: Build DPDK
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Check out code
         uses: actions/checkout@v3

.github/workflows/codeql-analysis.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   analyze:
     name: Analyze
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     strategy:
       fail-fast: false

.github/workflows/lint.yaml

@@ -14,12 +14,10 @@ env:
 jobs:
   golangci:
     name: lint
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-
-      - name: Set up Go 1.x
-        uses: actions/setup-go@v3
+      - uses: actions/setup-go@v3
         with:
           go-version: '${{ env.GO_VERSION }}'
           check-latest: true

.github/workflows/push-multiarch-image.yaml

@@ -11,13 +11,10 @@ on:
 jobs:
   build:
     name: Push multi arch images
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v3
-
-      - name: Docker Buildx
-        uses: docker/setup-buildx-action@v2
+      - uses: actions/checkout@v3
+      - uses: docker/setup-buildx-action@v2
 
       - name: Push
         if: ${{ github.ref == 'refs/heads/master' || contains(github.ref, 'release') }}