#108: add atlassian bamboo as cloud build

Author: lmeyer2

src/NerdBank.GitVersioning/CloudBuildServices/AtlassianBamboo.cs

@@ -0,0 +1,38 @@
+namespace Nerdbank.GitVersioning.CloudBuildServices
+{
+    using System;
+    using System.Collections.Generic;
+    using System.IO;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <remarks>
+    /// The Bamboo-specific properties referenced here are documented here:
+    /// https://confluence.atlassian.com/bamboo/bamboo-variables-289277087.html
+    /// </remarks>
+    internal class AtlassianBamboo : ICloudBuild
+    {
+        public bool IsPullRequest => false; 
+
+        public string BuildingTag => null;
+
+        public string BuildingBranch => CloudBuild.ShouldStartWith(Environment.GetEnvironmentVariable("bamboo.planRepository.branch"), "refs/heads/");
+
+        public string BuildingRef => this.BuildingBranch;
+
+        public string GitCommitId => Environment.GetEnvironmentVariable("bamboo.planRepository.revision");
+
+        public bool IsApplicable => !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("bamboo.buildKey"));
+
+        public IReadOnlyDictionary<string, string> SetCloudBuildNumber(string buildNumber, TextWriter stdout, TextWriter stderr)
+        {
+            return new Dictionary<string, string>();
+        }
+
+        public IReadOnlyDictionary<string, string> SetCloudBuildVariable(string name, string value, TextWriter stdout, TextWriter stderr)
+        {
+            return new Dictionary<string, string>();
+        }
+    }
+}