Fix yaml error

Author: insspb

.github/workflows/coverage.yml

@@ -12,15 +12,15 @@ on:
       - "*"
 
 jobs:
-  build:
+  coverage:
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         mongodb-version: [4.2]
         include:
           - name: "coverage"
             python: "3.8"
-            os: ubuntu-latest
             tox_env: "py38"
 
     steps:

.github/workflows/linting.yml

@@ -12,14 +12,14 @@ on:
       - "*"
 
 jobs:
-  build:
+  linting:
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         include:
           - name: "linting"
             python: "3.8"
-            os: ubuntu-latest
             tox_env: "lint"
 
     steps:

.github/workflows/main.yml

@@ -12,26 +12,23 @@ on:
 
 jobs:
   build:
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         mongodb-version: [3.6, 4.0, 4.2]
         include:
           - name: "ubuntu-py36"
             python: "3.6"
-            os: ubuntu-latest
             tox_env: "py36"
           - name: "ubuntu-py37"
             python: "3.7"
-            os: ubuntu-latest
             tox_env: "py37"
           - name: "ubuntu-py38"
             python: "3.8"
-            os: ubuntu-latest
             tox_env: "py38"
           - name: "ubuntu-pypy3"
             python: "pypy3"
-            os: ubuntu-latest
             tox_env: "pypy3"
 
     steps: