change ubuntu version

.github/workflows/coverage.yml

@@ -7,7 +7,7 @@ name: Execute code coverage
 
 jobs:
   nightly-coverage:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1

.github/workflows/publish-binaries.yml

@@ -10,9 +10,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-18.04, macos-latest, windows-latest]
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-18.04
             artifact_name: meilisearch
             asset_name: meilisearch-linux-amd64
           - os: macos-latest

.github/workflows/publish-deb-brew-pkg.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   debian:
     name: Publish debian packagge
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - uses: hecrj/setup-rust-action@master
       with:
@@ -29,7 +29,7 @@ jobs:
 
   homebrew:
     name: Bump Homebrew formula
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - name: Create PR to Homebrew
         uses: mislav/bump-homebrew-formula-action@v1

.github/workflows/publish-docker-latest.yml

@@ -7,7 +7,7 @@ name: Publish latest image to Docker Hub
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
       - name: Check if current release is latest

.github/workflows/publish-docker-tag.yml

@@ -8,7 +8,7 @@ name: Publish tagged image to Docker Hub
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v1
       - name: Publish to Registry

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-18.04, macos-latest]
     steps:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
@@ -38,7 +38,7 @@ jobs:
 
   build-image:
     name: Test the build of Docker image
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v1
     - run: docker build . --file Dockerfile -t meilisearch
@@ -49,7 +49,7 @@ jobs:
     name: create prerelease
     needs: [check, build-image]
     if: ${{ contains(github.ref, 'release-') && github.event_name == 'push' }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
@@ -76,7 +76,7 @@ jobs:
     name: create release
     needs: [check, build-image]
     if:  ${{ contains(github.ref, 'tags/v') }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

bors.toml

@@ -1,3 +1,3 @@
-status = ["Test on macos-latest", "Test on ubuntu-latest"]
+status = ["Test on macos-latest", "Test on ubuntu-18.04"]
 # 4 hours timeout
 timeout-sec = 14400