CLI add build args (#385)

This feature allows users to pass arguments used during the template
build.

E.g.:
```
e2b template build --build-arg="HELLO=WORLD" --build-arg="MULTIPLE=True"
```

.changeset/strange-readers-scream.md

@@ -0,0 +1,5 @@
+---
+"@e2b/cli": patch
+---
+
+Add possibility to pass docker build args

apps/docs/src/app/cli/commands/page.mdx

@@ -109,6 +109,9 @@ If there is no `e2b.toml` config a new template will be created.
   <Option type="--memory-mb" name="memory-mb">
     Specify the amount of memory in megabytes that will be used to run the sandbox. Must be an even number. The default value is 512.
   </Option>
+  <Option type="--build-arg" name="build-arg">
+    Specify a build argument for the Dockerfile. The format is `key=value`. You can use this option multiple times.
+  </Option>
 </Options>
 
 ## `template delete`

apps/docs/src/app/sandbox/templates/template-file/page.mdx

@@ -23,7 +23,7 @@ The Dockerfile must be Debian based (e.g. Ubuntu). Only the following [Dockerfil
   - `COPY`
   - `RUN`
   - `WORKDIR`
-
+  - `ARG`
 
 ## Example
 

packages/cli/src/commands/template/build.ts

@@ -99,6 +99,10 @@ export const buildCommand = new commander.Command('build')
     'specify the amount of memory in megabytes that will be used to run the sandbox. Must be an even number. The default value is 512.',
     parseInt,
   )
+  .option(
+    '--build-arg <args...>',
+    'specify additional build arguments for the build command. The format should be <varname>=<value>.',
+  )
   .alias('bd')
   .action(
     async (
@@ -111,6 +115,7 @@ export const buildCommand = new commander.Command('build')
         config?: string
         cpuCount?: number
         memoryMb?: number
+        buildArgs?: [string]
       },
     ) => {
       try {
@@ -122,6 +127,14 @@ export const buildCommand = new commander.Command('build')
           process.exit(1)
         }
 
+        const dockerBuildArgs: {[key: string]: string} = {}
+        if (opts.buildArgs) {
+            opts.buildArgs.forEach((arg) => {
+                const [key, value] = arg.split('=')
+                dockerBuildArgs[key] = value
+            })
+        }
+
         const accessToken = ensureAccessToken()
         process.stdout.write('\n')
 
@@ -265,7 +278,7 @@ export const buildCommand = new commander.Command('build')
 
         console.log('Building docker image...')
         child_process.execSync(
-          `docker build . -f ${dockerfileRelativePath} --platform linux/amd64 -t docker.${e2b.SANDBOX_DOMAIN}/e2b/custom-envs/${templateID}:${template.buildID}`,
+          `docker build . -f ${dockerfileRelativePath} --platform linux/amd64 -t docker.${e2b.SANDBOX_DOMAIN}/e2b/custom-envs/${templateID}:${template.buildID} ${Object.entries(dockerBuildArgs).map(([key, value]) => `--build-arg ${key}=${value}`).join(' ')}`,
           {
             stdio: 'inherit',
             cwd: root,
@@ -502,7 +515,7 @@ function getDockerfile(root: string, file?: string) {
   throw new Error(
     `No ${asLocalRelative(defaultDockerfileRelativePath)} or ${asLocalRelative(
       fallbackDockerfileRelativeName,
-    )} found in the root directory.You can specify a custom Dockerfile with ${asBold(
+    )} found in the root directory (${root}). You can specify a custom Dockerfile with ${asBold(
       '--dockerfile <file>',
     )} option.`,
   )