[ci] Drop support for Ubuntu 20.04

Ubuntu 20.04 is in the process of being [deprecated for github
actions](actions/runner-images#11101) and
will be fully unsupported by 2025-04-01.

.github/workflows/build-linux-binaries.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   build-x86_64-binaries-tarball:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     permissions:
       id-token: write
       contents: read
@@ -58,7 +58,7 @@ jobs:
           TAG: ${{ env.TAG }}
           BUCKET: ${{ secrets.BUCKET }}
           ARCH: "amd64"
-          RELEASE: "focal"
+          RELEASE: "jammy"
 
       - name: Save as Github artifact
         uses: actions/upload-artifact@v4

.github/workflows/build-ubuntu-amd64-release.yml

@@ -11,64 +11,6 @@ on:
       - "*"
 
 jobs:
-  build-focal-amd64-package:
-    runs-on: ubuntu-20.04
-    permissions:
-      id-token: write
-      contents: read
-
-    steps:
-      - uses: actions/checkout@v4
-      - uses: ./.github/actions/setup-go-for-project
-      - run: go version
-
-      - name: Build the avalanchego binaries
-        run: ./scripts/build.sh
-
-      - name: Install aws cli
-        run: sudo snap install aws-cli --classic
-
-      - name: Try to get tag from git
-        if: "${{ github.event.inputs.tag == '' }}"
-        id: get_tag_from_git
-        run: |
-          echo "TAG=${GITHUB_REF/refs\/tags\//}" >> "$GITHUB_ENV"
-        shell: bash
-
-      - name: Try to get tag from workflow dispatch
-        if: "${{ github.event.inputs.tag != '' }}"
-        id: get_tag_from_workflow
-        run: |
-          echo "TAG=${{ github.event.inputs.tag }}" >> "$GITHUB_ENV"
-        shell: bash
-
-      - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v4
-        with:
-          role-to-assume: ${{ secrets.AWS_DEPLOY_SA_ROLE_ARN }}
-          role-session-name: githubrolesession
-          aws-region: us-east-1
-
-      - name: Create debian package
-        run: ./.github/workflows/build-deb-pkg.sh
-        env:
-          PKG_ROOT: /tmp/avalanchego
-          TAG: ${{ env.TAG }}
-          BUCKET: ${{ secrets.BUCKET }}
-          ARCH: "amd64"
-          RELEASE: "focal"
-
-      - name: Save as Github artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: focal
-          path:  /tmp/avalanchego/avalanchego-${{ env.TAG }}-amd64.deb
-
-      - name: Cleanup
-        run: |
-          rm -rf ./build
-          rm -rf /tmp/avalanchego
-
   build-jammy-amd64-package:
     runs-on: ubuntu-22.04
     permissions:

README.md

@@ -18,7 +18,7 @@ The minimum recommended hardware specification for nodes connected to Mainnet is
 - RAM: 16 GiB
 - Storage: 1 TiB
   - Nodes running for very long periods of time or nodes with custom configurations may observe higher storage requirements.
-- OS: Ubuntu 20.04/22.04 or macOS >= 12
+- OS: Ubuntu 22.04/24.04 or macOS >= 12
 - Network: Reliable IPv4 or IPv6 network connection, with an open public port.
 
 If you plan to build AvalancheGo from source, you will also need the following software: