ci: use 'ubuntu-20.04' runner image rather than 'ubuntu-latest' (deno…

…land#12733)

The existing ubuntu-latest-xl runner image (based on Ubuntu 18.04 XL) is
deprecated and will retire soon. Migrate to ubuntu-20.04-xl instead.

.github/workflows/ci.yml

@@ -25,18 +25,18 @@ jobs:
  - os: windows-2019
  job: test
  profile: release
- - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-latest-xl' || 'ubuntu-latest' }}
+ - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-20.04-xl' || 'ubuntu-20.04' }}
  job: test
  profile: release
  use_sysroot: true
- - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-latest-xl' || 'ubuntu-latest' }}
+ - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-20.04-xl' || 'ubuntu-20.04' }}
  job: bench
  profile: release
  use_sysroot: true
- - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-latest-xl' || 'ubuntu-latest' }}
+ - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-20.04-xl' || 'ubuntu-20.04' }}
  job: test
  profile: debug
- - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-latest-xl' || 'ubuntu-latest' }}
+ - os: ${{ github.repository == 'denoland/deno' && 'ubuntu-20.04-xl' || 'ubuntu-20.04' }}
  job: lint
  profile: debug
 
@@ -165,7 +165,7 @@ jobs:
  run: |
  # Avoid running man-db triggers, which sometimes takes several minutes
  # to complete.
- sudo apt-get remove -y --purge man-db
+ sudo apt-get remove --purge -y man-db
  sudo apt-get update
  sudo apt-get install debootstrap
 
@@ -190,9 +190,9 @@ jobs:
  curl https://apt.llvm.org/llvm-snapshot.gpg.key |
  gpg --dearmor |
  sudo dd of=/sysroot/etc/apt/trusted.gpg.d/llvm-snapshot.gpg
- sudo chroot /sysroot apt update -y
- sudo chroot /sysroot apt install --no-install-recommends -y \
- clang-13 lld-13
+ sudo chroot /sysroot apt-get update
+ sudo chroot /sysroot apt-get install --no-install-recommends -y \
+  clang-13 lld-13
 
  # Redirect ld invocations to ld.lld-13 inside the chroot environment.
  # Setting the 'LD' environment variable doesn't always work.
@@ -621,7 +621,7 @@ jobs:
  publish-canary:
  name: publish canary
  runs-on: ubuntu-20.04
- needs: ['build']
+ needs: ["build"]
  if: github.repository == 'denoland/deno' &&
  (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/'))
  steps: