refactor(deploy.yml): improve SSH deployment process

- Added steps to prepare SSH keys and known hosts for secure connections.
- Implemented a test for the SSH connection to ensure successful deployment.
- Updated the deployment step to use SSH for executing the deployment script on the production server.

.gitea/workflows/deploy.yml

@@ -10,12 +10,23 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Run deployment on production server
-        uses: appleboy/ssh-action@v1.0.3
-        with:
-          host: ${{ secrets.PROD_HOST }}
-          username: ${{ secrets.PROD_USER }}
-          key: ${{ secrets.PROD_SSH_KEY }}
-          port: ${{ secrets.PROD_PORT }}
-          script: |
-            /home/tsschulz/actualize-yourpart.sh
+      - name: Prepare SSH
+        run: |
+          mkdir -p ~/.ssh
+          printf "%s" "${{ secrets.PROD_SSH_KEY }}" > ~/.ssh/id_ed25519
+          chmod 600 ~/.ssh/id_ed25519
+          ssh-keyscan -p "${{ secrets.PROD_PORT }}" "${{ secrets.PROD_HOST }}" >> ~/.ssh/known_hosts
+
+      - name: Test SSH connection
+        run: |
+          ssh -i ~/.ssh/id_ed25519 \
+            -p "${{ secrets.PROD_PORT }}" \
+            "${{ secrets.PROD_USER }}@${{ secrets.PROD_HOST }}" \
+            "echo SSH OK"
+
+      - name: Run deployment script
+        run: |
+          ssh -i ~/.ssh/id_ed25519 \
+            -p "${{ secrets.PROD_PORT }}" \
+            "${{ secrets.PROD_USER }}@${{ secrets.PROD_HOST }}" \
+            "/home/tsschulz/actualize-yourpart.sh"