Add --ssh arg support

Signed-off-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

README.md

@@ -673,6 +673,7 @@ Following inputs can be used as `step.with` keys
 | `cache-from`        | List     | List of [external cache sources](https://github.com/docker/buildx#--cache-fromnametypetypekeyvalue) (eg. `type=local,src=path/to/dir`) |
 | `cache-to`          | List     | List of [cache export destinations](https://github.com/docker/buildx#--cache-tonametypetypekeyvalue) (eg. `type=local,dest=path/to/dir`) |
 | `secrets`           | List     | List of secrets to expose to the build (eg. `key=value`, `GIT_AUTH_TOKEN=mytoken`) |
+| `ssh`               | List     | List of SSH agent socket or keys to expose to the build (eg: `default|<id>[=<socket>|<key>[,<key>]]`) |
 
 ### outputs
 

action.yml

@@ -67,6 +67,9 @@ inputs:
     description: "GitHub Token used to authenticate against a repository for Git context"
     default: ${{ github.token }}
     required: false
+  ssh:
+    description: "List of SSH agent socket or keys to expose to the build (eg: default)"
+    required: false
 
 outputs:
   digest:

src/context.ts

@@ -3,10 +3,12 @@ import * as os from 'os';
 import * as path from 'path';
 import * as semver from 'semver';
 import * as tmp from 'tmp';
-import * as buildx from './buildx';
+
 import * as core from '@actions/core';
 import * as github from '@actions/github';
 
+import * as buildx from './buildx';
+
 let _defaultContext, _tmpDir: string;
 
 export interface Inputs {
@@ -28,6 +30,7 @@ export interface Inputs {
   cacheTo: string[];
   secrets: string[];
   githubToken: string;
+  ssh: string[];
 }
 
 export function defaultContext(): string {
@@ -69,7 +72,8 @@ export async function getInputs(defaultContext: string): Promise<Inputs> {
     cacheFrom: await getInputList('cache-from', true),
     cacheTo: await getInputList('cache-to', true),
     secrets: await getInputList('secrets', true),
-    githubToken: core.getInput('github-token')
+    githubToken: core.getInput('github-token'),
+    ssh: await getInputList('ssh')
   };
 }
 
@@ -122,6 +126,9 @@ async function getBuildArgs(inputs: Inputs, defaultContext: string, buildxVersio
   if (inputs.githubToken && !buildx.hasGitAuthToken(inputs.secrets) && inputs.context == defaultContext) {
     args.push('--secret', await buildx.getSecret(`GIT_AUTH_TOKEN=${inputs.githubToken}`));
   }
+  await asyncForEach(inputs.ssh, async ssh => {
+    args.push('--ssh', ssh);
+  });
   if (inputs.file) {
     args.push('--file', inputs.file);
   }