Use fixed version of ubuntu (#110)

We want to pin all our dependencies, so that our builds are
reproducible.

.github/workflows/build_and_push_image.yml

@@ -7,7 +7,7 @@ jobs:
 
   build_and_push_docker_image:
     name: Build and push image
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - uses: docker/[email protected]

.github/workflows/check-commit-message.yml

@@ -15,7 +15,7 @@ jobs:
   check-commit-message-style:
     if: (github.actor!= 'dependabot[bot]') && (contains(github.head_ref, 'dependabot/github_actions/') == false)
     name: Check commit message style
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Check
         uses: mristin/[email protected]

.github/workflows/check_semver_labels.yml

@@ -13,7 +13,7 @@ jobs:
 
   check_semver_label:
     name: Check for semantic version label
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       # always use the latest version here, can't use Dependabot or we'll be caught in an infinite update loop
       - uses: docker://agilepathway/pull-request-label-checker:latest

.github/workflows/github_tag_and_release.yml

@@ -10,7 +10,7 @@ jobs:
 
   tag:
     name: Tag semantic version
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     outputs:
       tag: ${{ steps.tag.outputs.tag }}
     steps:
@@ -26,7 +26,7 @@ jobs:
   release:
     needs: tag
     name: Create GitHub Release
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       -
         name: Checkout
@@ -50,7 +50,7 @@ jobs:
   build_and_push_docker_image:
     needs: tag
     name: Build and push image
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - uses: docker/[email protected]

.github/workflows/integration_test.yml

@@ -8,7 +8,7 @@ name: Tests
 jobs:
   tests:
     name: Integration
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Install Go
         uses: actions/[email protected]

.github/workflows/reviewdog.yml

@@ -7,7 +7,7 @@ jobs:
 
   golangci-lint:
     name: runner / golangci-lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - uses: reviewdog/[email protected]
@@ -19,7 +19,7 @@ jobs:
 
   hadolint:
     name: runner / hadolint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Check out code
         uses: actions/[email protected]
@@ -31,7 +31,7 @@ jobs:
 
   yamllint:
     name: runner / yamllint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - name: yamllint
@@ -42,7 +42,7 @@ jobs:
 
   shellcheck:
     name: runner / shellcheck
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - name: shellcheck
@@ -56,7 +56,7 @@ jobs:
 
   misspell:
     name: runner / misspell
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - uses: reviewdog/[email protected]
@@ -66,7 +66,7 @@ jobs:
 
   languagetool:
     name: runner / languagetool
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/[email protected]
       - uses: reviewdog/[email protected]

.github/workflows/virtual_test.yml

@@ -8,7 +8,7 @@ name: Tests
 jobs:
   tests:
     name: Virtual
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Install Go
         uses: actions/[email protected]