build: Cleanup workflow action steps

.gitea/workflows/actions.yaml

@@ -72,20 +72,17 @@ jobs:
         id: setup
         with:
           version: "latest"
-      - name: Run `packer init`
+      - name: Prepare build environment
         id: init
-        run: packer init -upgrade ./packer
-      - name: Prepare dependencies and inject configuration
         run: |
-          export BUILD_COMMIT=$(echo "${{ gitea.sha }}" | cut -c 1-10)
-          export BUILD_SUFFIX=$(openssl rand -hex 3)
-
-          sed -i -e "s/<<img-password>>/${{ secrets.SSH_PASSWORD }}/g" \
-            packer/preseed/UbuntuServer22.04/user-data
+          packer init -upgrade ./packer
 
           ansible-galaxy collection install \
             -r ansible/requirements.yml \
             -p ./ansible/collections
+
+          echo "BUILD_COMMIT=$(echo ${{ gitea.sha }} | cut -c 1-10)" >> $GITHUB_ENV
+          echo "BUILD_SUFFIX=$(openssl rand -hex 3)" >> $GITHUB_ENV
       - name: Run `packer validate`
         id: validate
         run: |