Change ubuntu-latest to specific version (ubuntu-20.04)

.github/workflows/js.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - uses: actions/checkout@v2
@@ -60,7 +60,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - uses: actions/checkout@v2
@@ -106,7 +106,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - uses: actions/checkout@v2

.github/workflows/markdown.yml

@@ -7,7 +7,7 @@ on:
     paths: ["**.md"]
 jobs:
   markdownlint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Setup Node.js environment

.github/workflows/notice_js.yml

@@ -2,7 +2,7 @@
 name: NOTICE-js verification
 env:
   node: 14.6.0
-  os: ubuntu-latest
+  os: ubuntu-20.04
 on: 
   push:
     paths:
@@ -18,7 +18,7 @@ on:
       - NOTICE-js
 jobs:
   notice_js:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1.4.4

.github/workflows/notice_ruby.yml

@@ -12,7 +12,7 @@ on:
       - Gemfile.lock
       - NOTICE-ruby
 env:
-  os: ubuntu-latest
+  os: ubuntu-20.04
   ruby: '2.7.2'
 jobs:
   notice_ruby:

.github/workflows/placeholders.yml

@@ -5,18 +5,18 @@ name: Placeholders
 on: ['push', 'pull_request']
 jobs:
   notice_js:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - run: 'echo "Placeholder for notice_js"'
   notice_ruby:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - run: 'echo "Placeholder for notice_ruby"'
   lint:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - run: 'echo "Placeholder for lint"'
@@ -24,7 +24,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - run: 'echo "Placeholder for jest"'
@@ -32,7 +32,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
     steps:
       - run: 'echo "Placeholder for webpack"'
@@ -40,7 +40,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
         ruby: [2.7.2]
     steps:

.github/workflows/ruby.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         node: [14.6.0]
         ruby: [2.7.2]
     steps: