Make all CIs running in ubuntu latest. (#7021)

.github/workflows/ci-it.yaml

@@ -27,7 +27,7 @@ env:
 
 jobs:
   CI:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     steps:
       - uses: actions/checkout@v2
@@ -65,7 +65,7 @@ jobs:
         run: tools/dependencies/check-LICENSE.sh
 
   CI-on-JDK11:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     steps:
       - uses: actions/checkout@v2

.github/workflows/dead-link-checker.yaml

@@ -21,7 +21,7 @@ on:
 
 jobs:
   CheckDeadLinks:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v2

.github/workflows/docker-ci.yaml

@@ -30,7 +30,7 @@ env:
   LOG_DIR: /tmp/skywalking
 jobs:
   build:
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       fail-fast: true

.github/workflows/e2e.istio.yaml

@@ -33,7 +33,7 @@ env:
 
 jobs:
   als:
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     timeout-minutes: 60
     strategy:
       fail-fast: true
@@ -171,7 +171,7 @@ jobs:
         run: minikube delete
 
   metrics-service:
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     timeout-minutes: 60
     name: Istio(${{ matrix.istio_version }})+MetricsService
     strategy:

.github/workflows/plugins-jdk14-test.0.yaml

@@ -37,7 +37,7 @@ on:
 jobs:
   PluginsJDK14Test:
     name: jdk14
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       matrix:

.github/workflows/plugins-test.0.yaml

@@ -37,7 +37,7 @@ on:
 jobs:
   PluginsTest:
     name: Plugin
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       matrix:

.github/workflows/plugins-test.1.yaml

@@ -37,7 +37,7 @@ on:
 jobs:
   PluginsTest:
     name: Plugin
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       matrix:

.github/workflows/plugins-test.2.yaml

@@ -37,7 +37,7 @@ on:
 jobs:
   PluginsTest:
     name: Plugin
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       matrix:

.github/workflows/plugins-test.3.yaml

@@ -37,7 +37,7 @@ on:
 jobs:
   PluginsTest:
     name: Plugin
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       matrix:
@@ -94,7 +94,7 @@ jobs:
 
   Oracle:
     name: Oracle
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     steps:
       - uses: actions/checkout@v2

docs/en/guides/Plugin-test.md

@@ -626,7 +626,7 @@ If a test case required to run in JDK 14 environment, please add you test case i
 jobs:
   PluginsTest:
     name: Plugin
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     timeout-minutes: 90
     strategy:
       fail-fast: true