change envsubst to sed

.gitea/workflows/deploy-compose-stack.yml

@@ -78,11 +78,9 @@ jobs:
 
       - name: Generate inventory from template
         run: |
-          cd ansible-shared
-          envsubst < inventory.template > inventory.ini
-        env:
-          STAF_HOST: ${{ secrets.STAF_HOST }}
-          STAF_ANSIBLE_USER: ${{ secrets.STAF_ANSIBLE_USER }}
+          sed -e "s/\${STAF_HOST}/${{ secrets.STAF_HOST }}/g" \
+              -e "s/\${STAF_ANSIBLE_USER}/${{ secrets.STAF_ANSIBLE_USER }}/g" \
+              inventory.template > inventory.ini
 
       - name: Deploy stack with Ansible
         run: |