Simplify deploy workflow: use actions/checkout, nix run rclone

.forgejo/workflows/deploy-landing.yml

@@ -9,17 +9,8 @@ jobs:
   deploy:
     runs-on: nixos
     steps:
-      - name: Create working directory
-        run: |
-          rm -rf /tmp/speckl-deploy-${{ github.run_id }}
-          mkdir -p /tmp/speckl-deploy-${{ github.run_id }}
-          echo "WORKDIR=/tmp/speckl-deploy-${{ github.run_id }}" >> $GITHUB_ENV
-
-      - name: Clone repo
-        run: |
-          git clone http://localhost:3000/sscoble/speckl.git "${{ env.WORKDIR }}"
-          cd "${{ env.WORKDIR }}"
-          git checkout ${{ github.sha }}
+      - name: Checkout
+        uses: actions/checkout@v4
 
       - name: Configure rclone
         run: |
@@ -35,4 +26,4 @@ jobs:
 
       - name: Deploy to Storj
         run: |
-          rclone sync "${{ env.WORKDIR }}/landing/" storj:speckl/ --progress
+          nix run nixpkgs#rclone -- sync landing/ storj:speckl/ --progress