Add option to add --build-arg's to docker

Add test for build args
Update jest and ts-jest to resolve an issue where the test file is missing: kulshekhar/ts-jest#1506

package.json

@@ -15,8 +15,8 @@
     "@types/jest": "^25.2.1",
     "@types/node": "^13.11.0",
     "@zeit/ncc": "^0.22.1",
-    "jest": "^25.2.7",
-    "ts-jest": "^25.3.1",
+    "jest": "^26.1.4",
+    "ts-jest": "^26.1.4",
     "typescript": "^3.8.3"
   }
 }

src/docker.test.ts

@@ -17,6 +17,7 @@ describe('Docker action', () => {
     process.env['INPUT_DOCKERFILE'] = 'Dockerfile';
     process.env['INPUT_LATESTBRANCH'] = 'master';
     process.env['GITHUB_REF'] = 'refs/heads/develop';
+    delete process.env['INPUT_BUILDARGS'];
     delete process.env['INPUT_CURRENTBRANCH'];
   });
 
@@ -98,6 +99,22 @@ describe('Docker action', () => {
     await expect(setOutput).toHaveBeenCalledWith('dockerTag', 'latest');
   });
 
+  it('should add the build args as --build-arg to the docker build', async () => {
+    process.env['INPUT_BUILDARGS'] = 'HOST=localhost\nPORT=8080';
+    const mockedExec = exec as jest.Mock<Promise<number>>;
+    mockedExec.mockReturnValue(Promise.resolve(0));
+
+    await docker();
+
+    await expect(exec).toHaveBeenCalledWith(
+      'docker build --build-arg HOST=localhost --build-arg PORT=8080 -f Dockerfile -t test-registry.io/HelloWorld:develop .',
+      [],
+      {
+        cwd: 'src',
+      },
+    );
+  });
+
   it('should build the docker image', async () => {
     const mockedExec = exec as jest.Mock<Promise<number>>;
     mockedExec.mockReturnValue(Promise.resolve(0));

src/docker.ts

@@ -30,6 +30,7 @@ export const docker = async () => {
   const dockerfile = core.getInput('dockerfile', { required: true });
   const latestBranch = core.getInput('latestBranch', { required: true });
   const currentBranch = core.getInput('currentBranch');
+  const buildArgs: string[] = core.getInput('buildArgs').split("\n").filter(x => x !== "");
 
   const dockerTag = getDockerTag(
     currentBranch !== '' ? currentBranch : process.env['GITHUB_REF']!,
@@ -45,11 +46,12 @@ export const docker = async () => {
         WorkingDirectory: ${workingDirectory}
         LatestBranch    : ${latestBranch}
         DockerTag       : ${dockerTag}
+        BuildArgs       : ${buildArgs.join(' ')}
     `);
 
   await runInGroup('Building image', async () => {
     const buildErrorCode = await exec(
-      `docker build -f ${dockerfile} -t ${dockerRegistry}/${imageName}:${dockerTag} .`,
+      `docker build ${buildArgs.map(a => '--build-arg ' + a + ' ').join('')}-f ${dockerfile} -t ${dockerRegistry}/${imageName}:${dockerTag} .`,
       [],
       {
         cwd: workingDirectory,