Fallback method for missing BYOND linux zips

.github/workflows/ci-pipeline.yml

@@ -111,6 +111,14 @@ jobs:
             VERSIONS=$(curl https://www.byond.com/download/version.txt)
             FULL_VERSION=$(echo "$VERSIONS" | tail -n1)
             echo "EDGE version evaluated to $FULL_VERSION"
+
+            # Also needs updating in ByondTest.cs
+            declare -A missing_linux_releases=([515.1612]="515.1611")
+
+            if [[ -n "${missing_linux_releases[$FULL_VERSION]}" ]] ; then
+                echo "$FULL_VERSION does not have a linux zip, falling back to ${missing_linux_releases[$FULL_VERSION]}"
+                FULL_VERSION=${missing_linux_releases[$FULL_VERSION]}
+            fi
         fi
         if [[ ! -f $HOME/byond-zips-cache/linux/$FULL_VERSION.zip ]] ; then
             BYOND_MAJOR=${FULL_VERSION%.*}

tests/Tgstation.Server.Tests/Live/Instance/ByondTest.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -58,7 +59,23 @@ namespace Tgstation.Server.Tests.Live.Instance
 			using var reader = new StreamReader(stream, Encoding.UTF8, false, -1, true);
 			var text = await reader.ReadToEndAsync();
 			var splits = text.Split('\n', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
-			return edgeVersion = Version.Parse(splits.Last());
+
+			var targetVersion = splits.Last();
+
+			var missingVersionMap = new PlatformIdentifier().IsWindows
+				? new Dictionary<string, string>()
+				{
+				}
+				// linux map also needs updating in CI
+				: new Dictionary<string, string>()
+				{
+					{ "515.1612", "515.1611" }
+				};
+
+			if (missingVersionMap.TryGetValue(targetVersion, out var remappedVersion))
+				targetVersion = remappedVersion;
+
+			return edgeVersion = Version.Parse(targetVersion);
 		}
 
 		async Task RunPartOne(CancellationToken cancellationToken)