CI: Add and use Ansible playbook to deploy frontend

This avoids a bunch of manual one-time set-up for the server, e.g.
installing and configuring Nginx. This also removes a dependency on some
third party GitHub actions.

.github/workflows/client-cd.yml

@@ -48,6 +48,11 @@ jobs:
     if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     steps:
+      - name: set up WARP (workaround for IPv6 on GitHub Actions)
+        uses: fscarmen/warp-on-actions@v1.1
+        with:
+          stack: ipv6
+
       - name: checkout current repository
         uses: actions/checkout@v4
 
@@ -66,13 +71,19 @@ jobs:
         working-directory: ./client
         run: npm run build
 
-      - name: deploy assets to server
-        uses: appleboy/scp-action@v0.1.7
-        with:
-          host: ${{ secrets.SSH_HOST }}
-          username: ${{ secrets.SSH_USER }}
-          key: ${{ secrets.SSH_KEY }}
-          port: ${{ secrets.SSH_PORT }}
-          source: "client/build/**"
-          target: "/var/www/stonks"
-          strip_components: 2
+      - name: setup SSH for Ansible
+        shell: bash
+        run: |
+          eval `ssh-agent -s`
+          mkdir -p /home/runner/.ssh/
+          touch /home/runner/.ssh/id_rsa
+          echo -e "${{secrets.SSH_KEY}}" > /home/runner/.ssh/id_rsa
+          chmod 700 /home/runner/.ssh/id_rsa
+          ssh-keyscan -t rsa,dsa,ecdsa,ed25519 ${{ secrets.SSH_HOST }} >> /home/runner/.ssh/known_hosts
+
+      - name: run Ansible deployment playbook
+        shell: bash
+        working-directory: ./ansible
+        run: |
+          ansible-playbook -vv --private-key /home/runner/.ssh/id_rsa -u ${{secrets.SSH_USER}} -i ${{ secrets.SSH_HOST }}, frontend.yml
+

ansible/files/baltic-stocks-location.conf

@@ -0,0 +1,8 @@
+location /stonks {
+    alias /var/www/stonks/;
+    try_files $uri $uri/index.html /index.html;
+}
+
+location ~ ^/stonks/api(/?.*) {
+    proxy_pass http://stonks-api/api$1$is_args$args;
+}

ansible/files/baltic-stocks-upstream.conf

@@ -0,0 +1,3 @@
+upstream stonks-api {
+    server localhost:12345;
+}

ansible/frontend.yml

@@ -0,0 +1,89 @@
+---
+
+- name: deploy frontend
+  hosts: all
+  tasks:
+    - name: apt update && apt upgrade
+      become: true
+      apt:
+        update_cache: yes
+        upgrade: yes
+
+    - name: install dependencies
+      become: true
+      apt:
+        pkg:
+          - curl
+          - gnupg2
+          - ca-certificates
+          - ubuntu-keyring
+          - rsync
+
+    - name: download Nginx apt repository key
+      become: true
+      ansible.builtin.get_url:
+        url: https://nginx.org/keys/nginx_signing.key
+        dest: /etc/apt/keyrings/nginx.asc
+
+    - name: add Nginx apt repository
+      become: true
+      ansible.builtin.apt_repository:
+        repo: deb [{% if ansible_architecture == "aarch64" %}arch=arm64{% endif %} signed-by=/etc/apt/keyrings/nginx.asc] https://nginx.org/packages/mainline/ubuntu {{ ansible_distribution_release }} stable
+        state: present
+        filename: nginx-test
+
+    - name: increase Nginx repository priority
+      become: true
+      ansible.builtin.copy:
+        dest: /etc/apt/preferences.d/99nginx
+        content: |
+          Package: *
+          Pin: origin nginx.org
+          Pin: release o=nginx
+          Pin-Priority: 900
+
+    - name: install Nginx
+      become: true
+      apt:
+        pkg:
+          - nginx
+
+    - name: deploy frontend files
+      ansible.posix.synchronize:
+        src: ../client/build/
+        dest: /var/www/stonks
+
+    - name: deploy nginx conf fragments
+      copy:
+        src: '{{item}}'
+        dest: '/etc/nginx/conf.d/'
+      loop:
+        - baltic-stocks-upstream.conf
+        - baltic-stocks-location.conf
+      tags: this
+
+
+    - name: include upstream block in nginx.conf
+      become: true
+      lineinfile:
+        path: /etc/nginx/nginx.conf
+        search_string: "include /etc/nginx/conf.d/baltic-stocks-upstream.conf;"
+        insertafter: "http {"
+        line: "    include /etc/nginx/conf.d/baltic-stocks-upstream.conf;"
+      tags: this
+
+    - name: include location block in nginx.conf
+      become: true
+      lineinfile:
+        path: /etc/nginx/nginx.conf
+        search_string: "include /etc/nginx/conf.d/baltic-stocks-location.conf;"
+        insertafter: 'listen\s*\[::\]:443 ssl default_server;'
+        line: "        include /etc/nginx/conf.d/baltic-stocks-location.conf;"
+      tags: this
+
+    - name: enable and run Nginx
+      become: true
+      ansible.builtin.systemd_service:
+        name: nginx.service
+        enabled: true
+        state: reloaded