ci: update packer build workflow

.github/workflows/packer.yml

@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
 
     - name: Install Packer
       run: |
-        curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
-        sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
-        sudo apt-get update && sudo apt-get install packer
+        wget -O - https://apt.releases.hashicorp.com/gpg | sudo gpg --dearmor -o /usr/share/keyrings/hashicorp-archive-keyring.gpg
+        echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(grep -oP '(?<=UBUNTU_CODENAME=).*' /etc/os-release || lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list
+        sudo apt update && sudo apt install packer
 
     - name: Build Droplet Image
       env:
@@ -28,4 +28,5 @@ jobs:
         WIKI_APP_VERSION: ${{ github.event.inputs.version }}
       working-directory: dev/packer
       run: |
+        packer plugins install github.com/digitalocean/digitalocean
         packer build digitalocean.json