ci: use ubuntu-latest instead of ubuntu-20.04

which is no longer available on Github

Author: cakebaker

.github/workflows/release.yml

@@ -47,7 +47,7 @@ on:
 jobs:
   # Run 'dist plan' (or host) to determine what tasks we need to do
   plan:
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
     outputs:
       val: ${{ steps.plan.outputs.manifest }}
       tag: ${{ !github.event.pull_request && github.ref_name || '' }}
@@ -168,7 +168,7 @@ jobs:
     needs:
       - plan
       - build-local-artifacts
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       BUILD_MANIFEST_NAME: target/distrib/global-dist-manifest.json
@@ -218,7 +218,7 @@ jobs:
     if: ${{ always() && needs.plan.outputs.publishing == 'true' && (needs.build-global-artifacts.result == 'skipped' || needs.build-global-artifacts.result == 'success') && (needs.build-local-artifacts.result == 'skipped' || needs.build-local-artifacts.result == 'success') }}
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
     outputs:
       val: ${{ steps.host.outputs.manifest }}
     steps:
@@ -282,7 +282,7 @@ jobs:
     # still allowing individual publish jobs to skip themselves (for prereleases).
     # "host" however must run to completion, no skipping allowed!
     if: ${{ always() && needs.host.result == 'success' }}
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:

dist-workspace.toml

@@ -17,3 +17,8 @@ pr-run-mode = "plan"
 install-path = "CARGO_HOME"
 # Whether to install an updater program
 install-updater = false
+# Ignore out-of-date contents
+allow-dirty = ["ci"]
+
+[dist.github-custom-runners]
+x86_64-unknown-linux-gnu = "ubuntu-latest"