Installing Wildcard certificate in CD environments

Because we are limited to 50 domain names per week with Let's encrypt, the continuous delivery environment is pretty fast failing to get new certificates.
We need to download a Wilcard certificate instead for the CD environments.

.github/workflows/build-and-deploy.yml

@@ -149,6 +149,21 @@ jobs:
       # Create a slugified value of the branch
       - uses: rlespinasse/github-slug-action@3.1.0
 
+      - name: Write certificate
+        run: echo "${CERTS_PRIVATE_KEY}" > secret.key
+        env:
+          CERTS_PRIVATE_KEY: ${{ secrets.CERTS_PRIVATE_KEY }}
+
+      - name: Download certificate
+        run: mkdir secrets && scp -i secret.key ubuntu@cert.workadventu.re:./config/live/workadventu.re/* secrets/
+
+      - name: Install certificates in namespace
+        uses: steebchen/kubectl@v1.0.0
+        env:
+          KUBE_CONFIG_DATA: ${{ secrets.KUBE_CONFIG_FILE }}
+        with:
+          args: -n workadventure-${{ github.event_name == 'pull_request' && env.GITHUB_HEAD_REF_SLUG || env.GITHUB_REF_SLUG }} create secret tls certificate-tls --key="secrets/privkey.pem" --cert="secrets/fullchain.pem"
+
       - name: Deploy
         uses: thecodingmachine/deeployer-action@master
         env: