Provide a default for linux to allow providing a custom limit on linux containers

action.yml

@@ -109,13 +109,14 @@ inputs:
   dockerCpuLimit:
     required: false
     default: ''
-    description: 'Number of CPU cores to assign the Windows docker container. Defaults to all available cores.'
+    description: 'Number of CPU cores to assign the docker container. Defaults to all available cores on all platforms.'
   dockerMemoryLimit:
     required: false
     default: ''
     description:
-      'Amount of memory to assign the Windows docker container. Defaults to 75% of total system memory rounded down to
-      the nearest gigabyte.'
+      'Amount of memory to assign the docker container. Defaults to 95% of total system memory rounded down to the
+      nearest megabyte on Linux and 80% on Windows. On unrecognized platforms, defaults to 75% of total system memory.
+      To manually specify a value, use the format <number><unit>, where unit is either m or g. ie: 512m = 512 megabytes'
   allowDirtyBuild:
     required: false
     default: ''

dist/index.js

@@ -5888,7 +5888,7 @@ class Docker {
         }
     }
     static getLinuxCommand(image, parameters, overrideCommands = '', additionalVariables = [], entrypointBash = false) {
-        const { workspace, actionFolder, runnerTempPath, sshAgent, sshPublicKeysDirectoryPath, gitPrivateToken, dockerWorkspacePath, } = parameters;
+        const { workspace, actionFolder, runnerTempPath, sshAgent, sshPublicKeysDirectoryPath, gitPrivateToken, dockerWorkspacePath, dockerCpuLimit, dockerMemoryLimit, } = parameters;
         const githubHome = node_path_1.default.join(runnerTempPath, '_github_home');
         if (!(0, node_fs_1.existsSync)(githubHome))
             (0, node_fs_1.mkdirSync)(githubHome);
@@ -5912,6 +5912,8 @@ class Docker {
             --volume "${actionFolder}/platforms/ubuntu/steps:/steps:z" \
             --volume "${actionFolder}/platforms/ubuntu/entrypoint.sh:/entrypoint.sh:z" \
             --volume "${actionFolder}/unity-config:/usr/share/unity3d/config/:z" \
+            --cpus=${dockerCpuLimit} \
+            --memory=${dockerMemoryLimit} \
             ${sshAgent ? `--volume ${sshAgent}:/ssh-agent` : ''} \
             ${sshAgent && !sshPublicKeysDirectoryPath
             ? '--volume /home/runner/.ssh/known_hosts:/root/.ssh/known_hosts:ro'
@@ -6917,8 +6919,20 @@ class Input {
         return Input.getInput('dockerCpuLimit') || node_os_1.default.cpus().length.toString();
     }
     static get dockerMemoryLimit() {
-        const bytesInGigabyte = 1024 * 1024 * 1024;
-        return Input.getInput('dockerMemoryLimit') || `${Math.floor((node_os_1.default.totalmem() / bytesInGigabyte) * 0.75)}G`;
+        const bytesInMegabyte = 1024 * 1024;
+        let memoryMultiplier;
+        switch (node_os_1.default.platform()) {
+            case 'linux':
+                memoryMultiplier = 0.95;
+                break;
+            case 'win32':
+                memoryMultiplier = 0.8;
+                break;
+            default:
+                memoryMultiplier = 0.75;
+                break;
+        }
+        return (Input.getInput('dockerMemoryLimit') || `${Math.floor((node_os_1.default.totalmem() / bytesInMegabyte) * memoryMultiplier)}m`);
     }
     static ToEnvVarFormat(input) {
         if (input.toUpperCase() === input) {

src/model/docker.ts

@@ -48,6 +48,8 @@ class Docker {
       sshPublicKeysDirectoryPath,
       gitPrivateToken,
       dockerWorkspacePath,
+      dockerCpuLimit,
+      dockerMemoryLimit,
     } = parameters;
 
     const githubHome = path.join(runnerTempPath, '_github_home');
@@ -72,6 +74,8 @@ class Docker {
             --volume "${actionFolder}/platforms/ubuntu/steps:/steps:z" \
             --volume "${actionFolder}/platforms/ubuntu/entrypoint.sh:/entrypoint.sh:z" \
             --volume "${actionFolder}/unity-config:/usr/share/unity3d/config/:z" \
+            --cpus=${dockerCpuLimit} \
+            --memory=${dockerMemoryLimit} \
             ${sshAgent ? `--volume ${sshAgent}:/ssh-agent` : ''} \
             ${
               sshAgent && !sshPublicKeysDirectoryPath

src/model/input.ts

@@ -232,9 +232,24 @@ class Input {
   }
 
   static get dockerMemoryLimit(): string {
-    const bytesInGigabyte = 1024 * 1024 * 1024;
+    const bytesInMegabyte = 1024 * 1024;
 
-    return Input.getInput('dockerMemoryLimit') || `${Math.floor((os.totalmem() / bytesInGigabyte) * 0.75)}G`;
+    let memoryMultiplier;
+    switch (os.platform()) {
+      case 'linux':
+        memoryMultiplier = 0.95;
+        break;
+      case 'win32':
+        memoryMultiplier = 0.8;
+        break;
+      default:
+        memoryMultiplier = 0.75;
+        break;
+    }
+
+    return (
+      Input.getInput('dockerMemoryLimit') || `${Math.floor((os.totalmem() / bytesInMegabyte) * memoryMultiplier)}m`
+    );
   }
 
   public static ToEnvVarFormat(input: string) {