github/workflows: upgrade runs-on to ubuntu-20.04 and fix codecov flags

.codecov.yml

@@ -1,75 +1,106 @@
 projects: *projects
   target: auto
-  threshold: 10%
+  threshold: 1%
   if_not_found: success
   if_ci_failed: error
 patch: *patch
   only_pulls: true
   target: auto
   threshold: 10%
 
+codecov:
+  allow_coverage_offsets: true
+
 coverage:
   precision: 1
   round: down
   range: "70...100"
 
   status:
     project:
-      default: off
-      Linux-1.13.x:
+      default: false
+      linux-1.13:
         <<: *projects
-      Linux-1.14.x:
+        flags:
+          - "linux-1.13"
+      linux-1.14:
         <<: *projects
-      Linux-1.15.x:
+        flags:
+          - "linux-1.14"
+      linux-1.15:
         <<: *projects
-      macOS-1.13.x:
+        flags:
+          - "linux-1.15"
+      macos-1.13:
         <<: *projects
-      macOS-1.14.x:
+        flags:
+          - "macos-1.13"
+      macos-1.14:
         <<: *projects
-      macOS-1.15.x:
+        flags:
+          - "macos-1.14"
+      macos-1.15:
         <<: *projects
+        flags:
+          - "macos-1.15"
     patch:
-      default: off
-      Linux-1.13.x:
+      default: false
+      linux-1.13:
         <<: *patch
-      Linux-1.14.x:
+      linux-1.14:
         <<: *patch
-      Linux-1.15.x:
+      linux-1.15:
         <<: *patch
-      macOS-1.13.x:
+      macos-1.13:
         <<: *patch
-      macOS-1.14.x:
+      macos-1.14:
         <<: *patch
-      macOS-1.15.x:
+      macos-1.15:
         <<: *patch
-    changes: true
+    changes:
+      default:
+        base: auto
+        if_ci_failed: success
+        only_pulls: false
+        branches:
+          - codecov-flags
+        flags:
+          - "linux-1.13"
+          - "linux-1.14"
+          - "linux-1.15"
+          - "macos-1.13"
+          - "macos-1.14"
+          - "macos-1.15"
 
 flags:
-  Linux-1.13.x:
+  linux-1.13:
     paths:
       - /
     carryforward: true
-  Linux-1.14.x:
+  linux-1.14:
     paths:
       - /
     carryforward: true
-  Linux-1.15.x:
+  linux-1.15:
     paths:
       - /
     carryforward: true
-  macOS-1.13.x:
+  macos-1.13:
     paths:
       - /
     carryforward: true
-  macOS-1.14.x:
+  macos-1.14:
     paths:
       - /
     carryforward: true
-  macOS-1.15.x:
+  macos-1.15:
     paths:
       - /
     carryforward: true
 
 comment:
   behavior: default
   require_changes: true
+
+github_checks:
+  annotations: true

.github/workflows/test.yml

@@ -2,28 +2,43 @@ name: Test
 
 on:
   push:
-    branches: "*"
+    branches:
+      - master
+    tags:
+      - "v*"
   pull_request:
     branches: "*"
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go-version: [ 1.13.x, 1.14.x, 1.15.x ]
-        os: [ ubuntu-latest, macos-latest ]
-    env:
-      OS: ${{ matrix.os }}
-      GO_VERSION: ${{ matrix.go-version }}
+        os:
+          # https://github.com/actions/virtual-environments/blob/ubuntu20/20201210.0/images/linux/Ubuntu2004-README.md
+          - ubuntu-20.04
+          # https://github.com/actions/virtual-environments/blob/macOS-10.15/20201212.1/images/macos/macos-10.15-Readme.md
+          - macos-10.15
+        go-version:
+          - 1.13.x
+          - 1.14.x
+          - 1.15.x
+    runs-on: ${{ matrix.os }}
+
     steps:
+    - name: Set flag environment variable
+      run: |
+        echo "OS=$(echo ${{ runner.os }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+        echo "GO_VERSION=$(echo ${{ matrix.go-version }} | cut -d. -f-2)" >> $GITHUB_ENV
+
     - name: Install Go
       uses: actions/setup-go@v2
       with:
         go-version: ${{ matrix.go-version }}
 
     - name: Checkout code
       uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
 
     - name: Install nvim binary
       uses: rhysd/action-setup-vim@v1
@@ -40,5 +55,5 @@ jobs:
     - uses: codecov/codecov-action@v1
       with:
         file: coverage.out
-        flags: ${{ runner.os }}-${{ matrix.go-version }}
+        flags: ${{ env.OS }}-${{ env.GO_VERSION }}
         fail_ci_if_error: true