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Have you tried something like?
```awsx.ecr.buildAndPushImage("myImage", {
  context: "src",
  args: {
    tag: "name:tag",
  },
});```

Function signature:
```export declare function buildAndPushImage(name: string, pathOrBuild: pulumi.Input&lt;string | docker.DockerBuild&gt;, args?: RepositoryArgs, opts?: pulumi.ComponentResourceOptions): RepositoryImage;```
looking at the  `docker.DockerBuild`:
```    /**
     * An optional map of named build-time argument variables to set during the Docker build.  This
     * flag allows you to pass built-time variables that can be accessed like environment variables
     * inside the `RUN` instruction.
     */
    args?: pulumi.Input&lt;Record&lt;string, pulumi.Input&lt;string&gt;&gt;&gt;;```

or it might be:

```    /**
     * An optional catch-all list of arguments to provide extra CLI options to the docker build command.  For
     * example `['--network', 'host']`.
     */
    extraOptions?: pulumi.Input&lt;pulumi.Input&lt;string&gt;[]&gt;;```

ah, i hadnt considered using the extraOptions but that makes sense.  thanks for the tip - i'll try that