feat: Add initial deployment setup for OTSSignsOrchestrator

- Create index.html for the web application interface.
- Implement deploy.sh script for building and deploying the application to a Docker Swarm manager.
- Add docker-compose.yml for defining application and PostgreSQL service configurations.

OTSSignsOrchestrator.Tests/ByoiCertExpiryThresholdTests.cs

@@ -0,0 +1,96 @@
+using OTSSignsOrchestrator.Jobs;
+
+namespace OTSSignsOrchestrator.Tests;
+
+public class ByoiCertExpiryThresholdTests
+{
+    // ── ShouldAlert ─────────────────────────────────────────────────────────
+
+    [Theory]
+    [InlineData(61, false)]   // 61 days: above all thresholds → no alert
+    [InlineData(60, true)]    // 60 days: at first threshold → alert
+    [InlineData(59, true)]    // 59 days: below 60 → alert
+    [InlineData(31, true)]    // 31 days: between 60 and 30 → alert
+    [InlineData(30, true)]    // 30 days: at second threshold → alert
+    [InlineData(8, true)]     // 8 days: between 30 and 7 → alert
+    [InlineData(7, true)]     // 7 days: at critical threshold → alert
+    [InlineData(1, true)]     // 1 day: below critical → alert
+    [InlineData(0, true)]     // 0 days: expiry day → alert
+    [InlineData(-1, true)]    // -1 day: already expired → alert
+    public void ShouldAlert_ReturnsCorrectValue(double daysRemaining, bool expected)
+    {
+        Assert.Equal(expected, ByoiCertExpiryJob.ShouldAlert(daysRemaining));
+    }
+
+    [Fact]
+    public void ShouldAlert_LargeValue_NoAlert()
+    {
+        Assert.False(ByoiCertExpiryJob.ShouldAlert(365));
+    }
+
+    // ── GetSeverity ─────────────────────────────────────────────────────────
+
+    [Theory]
+    [InlineData(60, "Warning")]
+    [InlineData(30, "Warning")]
+    [InlineData(8, "Warning")]
+    [InlineData(7.01, "Warning")]
+    [InlineData(7, "Critical")]    // Exactly at critical boundary
+    [InlineData(6, "Critical")]
+    [InlineData(1, "Critical")]
+    [InlineData(0, "Critical")]
+    [InlineData(-1, "Critical")]   // Already expired
+    public void GetSeverity_ReturnsCorrectLevel(double daysRemaining, string expected)
+    {
+        Assert.Equal(expected, ByoiCertExpiryJob.GetSeverity(daysRemaining));
+    }
+
+    // ── Threshold constants ─────────────────────────────────────────────────
+
+    [Fact]
+    public void AlertThresholds_AreDescending()
+    {
+        var thresholds = ByoiCertExpiryJob.AlertThresholdDays;
+        for (int i = 1; i < thresholds.Length; i++)
+        {
+            Assert.True(thresholds[i - 1] > thresholds[i],
+                $"Thresholds must be in descending order: {thresholds[i - 1]} should be > {thresholds[i]}");
+        }
+    }
+
+    [Fact]
+    public void CriticalThreshold_IsSmallestAlertThreshold()
+    {
+        Assert.Equal(
+            ByoiCertExpiryJob.CriticalThresholdDays,
+            ByoiCertExpiryJob.AlertThresholdDays[^1]);
+    }
+
+    // ── Boundary precision ──────────────────────────────────────────────────
+
+    [Fact]
+    public void ShouldAlert_JustAboveThreshold_NoAlert()
+    {
+        // 60.001 days — just above 60-day threshold
+        Assert.False(ByoiCertExpiryJob.ShouldAlert(60.001));
+    }
+
+    [Fact]
+    public void ShouldAlert_JustBelowThreshold_Alerts()
+    {
+        // 59.999 days — just below 60-day threshold
+        Assert.True(ByoiCertExpiryJob.ShouldAlert(59.999));
+    }
+
+    [Fact]
+    public void GetSeverity_JustAboveCritical_IsWarning()
+    {
+        Assert.Equal("Warning", ByoiCertExpiryJob.GetSeverity(7.001));
+    }
+
+    [Fact]
+    public void GetSeverity_ExactlyCritical_IsCritical()
+    {
+        Assert.Equal("Critical", ByoiCertExpiryJob.GetSeverity(7.0));
+    }
+}

OTSSignsOrchestrator.Tests/OTSSignsOrchestrator.Tests.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\OTSSignsOrchestrator\OTSSignsOrchestrator.csproj" />
+  </ItemGroup>
+
+</Project>