feat: add build config configurator

### What does this PR do?

* Adds automated way to create a build config json file
* Added to build page

### Screenshot / video of UI

<!-- If this PR is changing UI, please include
screenshots or screencasts showing the difference -->

### What issues does this PR fix or reference?

<!-- Include any related issues from Podman Desktop
repository (or from another issue tracker). -->

Closes #827

### How to test this PR?

<!-- Please explain steps to reproduce -->

Use build config and configure / create your own custom build config
   with users, filesystem, etc.

packages/backend/src/build-disk-image.spec.ts

@@ -24,11 +24,12 @@ import {
   createPodmanCLIRunCommand,
   getBuilder,
   getUnusedName,
+  createBuildConfigJSON,
 } from './build-disk-image';
 import { bootcImageBuilderCentos, bootcImageBuilderRHEL } from './constants';
 import type { ContainerInfo, Configuration } from '@podman-desktop/api';
 import { containerEngine } from '@podman-desktop/api';
-import type { BootcBuildInfo } from '/@shared/src/models/bootc';
+import type { BootcBuildInfo, BuildConfig } from '/@shared/src/models/bootc';
 import * as fs from 'node:fs';
 import path, { resolve } from 'node:path';
 
@@ -470,3 +471,93 @@ test('test chown works when passed into createBuilderImageOptions', async () =>
   expect(options.Cmd).toContain('--chown');
   expect(options.Cmd).toContain(build.chown);
 });
+
+test('test createBuildConfigJSON function works when passing in a build config with user, filesystem and kernel', async () => {
+  const buildConfig = {
+    user: [
+      {
+        name: 'test-user',
+        // eslint-disable-next-line sonarjs/no-hardcoded-credentials
+        password: 'test-password',
+        key: 'test-key',
+        groups: ['test-group'],
+      },
+    ],
+    filesystem: [
+      {
+        mountpoint: '/test/mountpoint',
+        minsize: '1GB',
+      },
+    ],
+    kernel: {
+      append: 'test-append',
+    },
+  } as BuildConfig;
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const buildConfigJson: Record<string, any> = createBuildConfigJSON(buildConfig);
+  expect(buildConfigJson).toBeDefined();
+
+  // buildConfigJson is Record<string, unknown>, but check that the first one is 'customnizations'
+  const keys = Object.keys(buildConfigJson);
+  expect(keys[0]).toEqual('customizations');
+
+  // Check that user, filesystem and kernel are included in the JSON
+  expect(buildConfigJson.customizations).toBeDefined();
+  expect(buildConfigJson?.customizations?.user[0]).toBeDefined();
+  expect(buildConfigJson?.customizations?.filesystem[0]).toBeDefined();
+  expect(buildConfigJson?.customizations?.kernel).toBeDefined();
+});
+
+test('test building with a buildConfig JSON file that a temporary file for buildconfig is passed to binds', async () => {
+  const buildConfig = {
+    user: [
+      {
+        name: 'test-user',
+        // eslint-disable-next-line sonarjs/no-hardcoded-credentials
+        password: 'test-password',
+        key: 'test-key',
+        groups: ['test-group'],
+      },
+    ],
+    filesystem: [
+      {
+        mountpoint: '/test/mountpoint',
+        minsize: '1GB',
+      },
+    ],
+    kernel: {
+      append: 'test-append',
+    },
+  } as BuildConfig;
+
+  const name = 'test123-bootc-image-builder';
+  const build = {
+    image: 'test-image',
+    tag: 'latest',
+    type: ['raw'],
+    arch: 'amd64',
+    folder: '/foo/bar/qemutest4',
+    buildConfig: buildConfig,
+  } as BootcBuildInfo;
+
+  // Spy on fs.writeFileSync to make sure it is called
+  vi.mock('node:fs');
+  vi.spyOn(fs, 'writeFileSync');
+
+  const options = createBuilderImageOptions(name, build);
+
+  // Expect writeFileSync was called
+  expect(fs.writeFileSync).toHaveBeenCalled();
+
+  // Expect that options.HostConfig.Binds includes a buildconfig file
+  expect(options).toBeDefined();
+  expect(options.HostConfig).toBeDefined();
+  expect(options.HostConfig?.Binds).toBeDefined();
+  if (options.HostConfig?.Binds) {
+    expect(options.HostConfig.Binds.length).toEqual(3);
+    expect(options.HostConfig.Binds[0]).toEqual(build.folder + ':/output/');
+    expect(options.HostConfig.Binds[1]).toEqual('/var/lib/containers/storage:/var/lib/containers/storage');
+    expect(options.HostConfig.Binds[2]).toContain('config.json:ro');
+  }
+});

packages/backend/src/build-disk-image.ts

@@ -23,7 +23,7 @@ import path, { resolve } from 'node:path';
 import os from 'node:os';
 import * as containerUtils from './container-utils';
 import { bootcImageBuilder, bootcImageBuilderCentos, bootcImageBuilderRHEL } from './constants';
-import type { BootcBuildInfo, BuildType } from '/@shared/src/models/bootc';
+import type { BootcBuildInfo, BuildConfig, BuildType } from '/@shared/src/models/bootc';
 import type { History } from './history';
 import * as machineUtils from './machine-utils';
 import { getConfigurationValue, telemetryLogger } from './extension';
@@ -465,6 +465,27 @@ export function createBuilderImageOptions(
     }
   }
 
+  // Check if build.buildConfig has ANYTHING defined, make sure it is not empty.
+  if (build.buildConfig) {
+    const buildConfig = createBuildConfigJSON(build.buildConfig);
+
+    // Make sure that cutomizations is exists and is not empty before adding it to the container.
+    if (buildConfig.customizations && Object.keys(buildConfig.customizations).length > 0) {
+      // Create a temporary path to store the buildConfig JSON
+      // with a temporary name
+      // eslint-disable-next-line sonarjs/pseudo-random
+      const buildConfigPath = path.join(os.tmpdir(), `${Math.floor(Math.random() * 100000)}.json`);
+
+      // Write the buildConfig JSON to the temporary file with JSON
+      fs.writeFileSync(buildConfigPath, JSON.stringify(buildConfig, undefined, 2));
+
+      // Add the mount to the configuration file
+      if (options.HostConfig?.Binds) {
+        options.HostConfig.Binds.push(buildConfigPath + ':/config.json:ro');
+      }
+    }
+  }
+
   // If there is the chown in build, add the --chown flag to the command with the value in chown
   if (build.chown) {
     cmd.push('--chown', build.chown);
@@ -473,6 +494,26 @@ export function createBuilderImageOptions(
   return options;
 }
 
+// Function that takes in BuildConfig and creates a JSON object out of the contents.
+// We will then return it as "cutomizations" which is required by bootc-image-builder
+export function createBuildConfigJSON(buildConfig: BuildConfig): Record<string, unknown> {
+  const config: Record<string, unknown> = {};
+
+  if (buildConfig.user && buildConfig.user.length > 0) {
+    config.user = buildConfig.user;
+  }
+
+  if (buildConfig.filesystem && buildConfig.filesystem.length > 0) {
+    config.filesystem = buildConfig.filesystem;
+  }
+
+  if (buildConfig.kernel?.append) {
+    config.kernel = buildConfig.kernel;
+  }
+
+  return { customizations: config };
+}
+
 // Creates a command that will be used to build the image on Linux. This includes adding the transfer-to-root script as well as the actual build command.
 // we also export to the log file during this process too.
 export function linuxBuildCommand(