feat: add dockerShmSize option to raise Docker's /dev/shm limit

src/command-options/build-options.ts

@@ -144,6 +144,15 @@ export class BuildOptions implements IOptions {
         demandOption: false,
         default: defaultDockerMemoryLimit(),
       })
+      .option('dockerShmSize', {
+        description: String.dedent`Size of /dev/shm to assign the docker container, using the format <number><unit>
+        (m or g). Unity 6.6 beta / 6.7 alpha editors have been reported to fail with "Insufficient shared memory
+        available" against Docker's 64m default (see game-ci/unity-test-runner#307); leave unset to use Docker's
+        own default on older/stable editors that don't need it.`,
+        type: 'string',
+        demandOption: false,
+        default: '',
+      })
       .option('dockerIsolationMode', {
         description: String.dedent`Windows only. Isolation mode to use for the docker container. Can be one of
         process, hyperv, or default. Default will pick the default mode as described by Microsoft where server

src/model/docker.test.ts

@@ -81,14 +81,31 @@ describe('Docker', () => {
       engine: 'unity',
       dockerCpuLimit: '4',
       dockerMemoryLimit: '8192m',
+      dockerShmSize: '1024m',
       useHostNetwork: true,
     });
 
     expect(command).toContain('--cpus=4');
     expect(command).toContain('--memory=8192m');
+    expect(command).toContain('--shm-size=1024m');
     expect(command).toContain('--net=host');
   });
 
+  it('omits --shm-size when dockerShmSize is not set (game-ci/unity-test-runner#307)', () => {
+    const command = (Docker as any).getLinuxCommand('game-ci/unity-editor-stub:latest', {
+      hostOS: 'linux',
+      currentWorkDir: '/home/runner/work/cli/cli',
+      homeDir: '/home/runner',
+      cliDistPath: '/home/runner/work/cli/cli/dist',
+      sshAgent: '',
+      gitPrivateToken: '',
+      dockerWorkspacePath: '/github/workspace',
+      engine: 'unity',
+    });
+
+    expect(command).not.toContain('--shm-size');
+  });
+
   it('mounts a custom SSH public keys directory instead of the known_hosts fallback', () => {
     const command = (Docker as any).getLinuxCommand('game-ci/unity-editor-stub:latest', {
       hostOS: 'linux',
@@ -134,11 +151,13 @@ describe('Docker', () => {
       engine: 'unity',
       dockerCpuLimit: '4',
       dockerMemoryLimit: '8192m',
+      dockerShmSize: '1024m',
       dockerIsolationMode: 'process',
     });
 
     expect(command).toContain('--cpus=4');
     expect(command).toContain('--memory=8192m');
+    expect(command).toContain('--shm-size=1024m');
     expect(command).toContain('--isolation=process');
   });
 

src/model/docker.ts

@@ -75,6 +75,7 @@ class Docker {
       useHostNetwork,
       dockerCpuLimit,
       dockerMemoryLimit,
+      dockerShmSize,
     } = options as Options & { commands?: string };
 
     const home = homeDir;
@@ -98,6 +99,7 @@ class Docker {
       sshAgent ? '--env SSH_AUTH_SOCK=/ssh-agent' : '',
       dockerCpuLimit ? `--cpus=${dockerCpuLimit}` : '',
       dockerMemoryLimit ? `--memory=${dockerMemoryLimit}` : '',
+      dockerShmSize ? `--shm-size=${dockerShmSize}` : '',
       useHostNetwork ? '--net=host' : '',
       `--volume "${home}":"/root:z"`,
       `--volume "${currentWorkDir}":"${dockerWorkspacePath}:z"`,
@@ -128,6 +130,7 @@ class Docker {
       engine,
       dockerCpuLimit,
       dockerMemoryLimit,
+      dockerShmSize,
       dockerIsolationMode,
     } = options as Options & { commands?: string };
 
@@ -150,6 +153,7 @@ class Docker {
       `  --env GIT_PRIVATE_TOKEN="${gitPrivateToken}" \``,
       dockerCpuLimit ? `  --cpus=${dockerCpuLimit} \`` : '',
       dockerMemoryLimit ? `  --memory=${dockerMemoryLimit} \`` : '',
+      dockerShmSize ? `  --shm-size=${dockerShmSize} \`` : '',
       dockerIsolationMode ? `  --isolation=${dockerIsolationMode} \`` : '',
       `  --volume="${currentWorkDir}":"c:${dockerWorkspacePath}" \``,
       isUnityDefaultFlow ? `  --volume="${cliStoragePath}/registry-keys":"c:/registry-keys" \`` : '',