Use ubuntu-latest in GitHub Actions (#73)

Prior to this commit we had harcoded the Ubuntu version in our GitHub
Actions to 20.04, with a GitHub Issue being automatically generated
every year to update to the latest version.

GitHub Actions only updates every 2 years, it turns out, not ever year,
as they only upgrade to LTS versions.  GitHub Actions don't support a
Cron scheduler in the format that's needed for every 2 years, so have
decided to be pragmatic and just use ubuntu-latest.

.github/DEPENDENCIES.md

@@ -57,8 +57,3 @@ We have [pinned the linux dependencies in the devcontainer Dockerfile](https://g
 2. Execute the Dockerfile (e.g. if it's a remote container Dockerfile build the remote container)
 3. Run `apt-cache policy <package>` for each package, to see the version installed
 4. Pin all the versions, replacing any old versions with new ones
-
-
-## Ubuntu version
-
-[Ubuntu releases annually in April](https://wiki.ubuntu.com/Releases).  In 2020 the GitHub Actions team [supported the new version by mid June](https://github.com/actions/virtual-environments/issues/228#issuecomment-644065532), so we have [an issue automatically created on for 15th July each year](https://github.com/agilepathway/hoverfly-github-action/pull/55) to prompt us to update. 

.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-20.04
+    runs-on: ubuntu-latest
     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-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: docker://agilepathway/pull-request-label-checker:v1.0.9
         with:

.github/workflows/dependabot_hack.yml

@@ -10,7 +10,7 @@ jobs:
 
   dependabot_hack:
     name: Ensure dependabot version checks
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
 
       # update the version manually in these places, too:

.github/workflows/github_tag_and_release.yml

@@ -10,7 +10,7 @@ jobs:
 
   tag:
     name: Tag semantic version
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Tag
         uses: K-Phoen/[email protected]
@@ -23,7 +23,7 @@ jobs:
   release:
     needs: tag
     name: Create GitHub Release
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       -
         name: Checkout

.github/workflows/reviewdog.yml

@@ -7,7 +7,7 @@ jobs:
 
   hadolint:
     name: runner / hadolint
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Check out code
         uses: actions/[email protected]
@@ -19,7 +19,7 @@ jobs:
 
   yamllint:
     name: runner / yamllint
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: yamllint
@@ -30,7 +30,7 @@ jobs:
 
   shellcheck:
     name: runner / shellcheck
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: shellcheck
@@ -44,7 +44,7 @@ jobs:
 
   misspell:
     name: runner / misspell
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - uses: reviewdog/[email protected]
@@ -54,7 +54,7 @@ jobs:
 
   languagetool:
     name: runner / languagetool
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - uses: reviewdog/[email protected]

.github/workflows/schedule_dockerfile_dependency_updates_issue.yml

@@ -8,7 +8,7 @@ on:  # yamllint disable-line rule:truthy
 jobs:
   create_issue:
     name: Create issue to update Dockerfile dependencies
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
 
       # Repo code checkout required if `template` is used

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
 
   install_latest_version_by_default:
     name: Install latest version by default
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: Install Hoverfly
@@ -34,7 +34,7 @@ jobs:
 
   install_specific_version:
     name: Install specific version
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       HOVERFLY_VERSION: v1.2.0
     steps:
@@ -52,7 +52,7 @@ jobs:
 
   install_fails_if_version_does_not_begin_with_v:
     name: Install fails if version does not begin with v
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       HOVERFLY_VERSION: "1.2.0"
     steps:
@@ -70,7 +70,7 @@ jobs:
 
   install_fails_if_no_runner_github_workspace_path:
     name: Install fails when no runner GitHub workspace path provided
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: Install Hoverfly
@@ -83,7 +83,7 @@ jobs:
 
   install_fails_if_incorrect_runner_github_workspace_path:
     name: Install fails when incorrect runner GitHub workspace path provided
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: Install Hoverfly
@@ -98,7 +98,7 @@ jobs:
 
   use_script_to_enable_https_simulations:
     name: Enable https simulations
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: Install Hoverfly
@@ -119,7 +119,7 @@ jobs:
 
   https_simulations_do_not_work_without_https_script:
     name: Verify https simulations will not work without script
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
       - name: Install Hoverfly