Deploy workflow (#500)

## Description:

Adds a github workflow to deploy changes to staging or production.

## Steps to enable this workflow

1. Create two github environments at
https://github.com/openfrontio/OpenFrontIO/settings/environments.
- They have to be named `production` and `staging`, unless you modify
the yaml.
2. In each github environment, create two two variables:
    -  `DOCKERHUB_REPO`
    - `DOCKERHUB_USERNAME`
3. In each github environment, create four secrets:
    - `DOCKERHUB_TOKEN`
    - `SERVER_HOST`
    - `SERVER_USERNAME`
    - `SSH_PRIVATE_KEY`

Fixes #504 

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

fake.neo

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -0,0 +1,38 @@
+name: Deploy to Remote
+
+on:
+  workflow_dispatch:
+    inputs:
+      target_environment:
+        description: "Deployment Environment"
+        required: true
+        default: "staging"
+        type: choice
+        options:
+          - production
+          - staging
+
+jobs:
+  deploy:
+    name: Deploy to ${{ inputs.target_environment }}
+    runs-on: ubuntu-latest
+    environment: ${{ inputs.target_environment }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_rsa
+          chmod 600 ~/.ssh/id_rsa
+          ssh-keyscan -H ${{ secrets.SERVER_HOST }} >> ~/.ssh/known_hosts
+          cat >.env <<EOF
+          SERVER_HOST_STAGING=${{ secrets.SERVER_USERNAME }}@${{ secrets.SERVER_HOST }}
+          DOCKER_REPO_STAGING=${{ vars.DOCKERHUB_REPO }}
+          DOCKER_USERNAME=${{ vars.DOCKERHUB_USERNAME }}
+          EOF
+          ./deploy.sh ${{ inputs.target_environment }}