ci: add the GitHub Actions configuration files

.github/ISSUE_TEMPLATE/features.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature
+assignees: <viewer>
+
+---
+
+**Is your feature request related to a problem? Please describe:**
+a clear and concise description of what the problem is. Ex.: I'm always frustrated when [...].
+
+**Describe the solution you'd like:**
+a clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered:**
+a clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context:**
+add any other context or screenshots about the feature request here.

.github/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Library                                                  | Version | Supported          |
+|----------------------------------------------------------|---------|--------------------|
+| [Rust](https://github.com/rust-lang/rust)                | 1.81.0  | :heavy_check_mark: |
+| [Shuttle Runtime](https://github.com/shuttle-hq/shuttle) | 0.48.0  | :heavy_check_mark: |

.github/workflows/ci.yml

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+---
+name: Deploy Rust app to Shuttle
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment: shuttle-rs
+    steps:
+      - uses: shuttle-hq/deploy-action@main
+        with:
+          cargo-shuttle-version: '0.48.2'
+          deploy-key: ${{ secrets.SHUTTLE_API_KEY }}
+          secrets: |
+            DATADOG_API_KEY = '${{ secrets.DATADOG_API_KEY }}'
+            DATADOG_LOG_LEVEL = '${{ secrets.DATADOG_LOG_LEVEL }}'
+            DATADOG_TAGS = '${{ secrets.DATADOG_TAGS }}'
+
+            SMTP_ADDR = '${{ secrets.SMTP_ADDR }}'
+            SMTP_AUTH = '${{ secrets.SMTP_AUTH }}'