use content hash for local image tag

sim/workload.w

@@ -10,13 +10,15 @@ class Workload impl api.IWorkload {
   urlKey: str;
   props: api.WorkloadProps;
   appDir: str;
-
+  imageTag: str;
+
   init(props: api.WorkloadProps) {
     this.appDir = utils.entrypointDir(this);
     this.props = props;
     let hash = util.sha256(Json.stringify(props));
     this.containerId = "wing-${this.node.addr.substring(0, 6)}-${hash}";
     this.bucket = new cloud.Bucket();
+    this.imageTag = utils.resolveContentHash(this, props);
 
     this.urlKey = "url";
 
@@ -39,14 +41,12 @@ class Workload impl api.IWorkload {
     let opts = this.props;
 
     let image = opts.image;
-    let var imageTag = image;
 
     // if this a reference to a local directory, build the image from a docker file
     log("image: ${image}");
     if image.startsWith("./") {
-      imageTag = this.containerId;
-      log("building locally from ${image} and tagging ${imageTag}...");
-      utils.shell("docker", ["build", "-t", imageTag, image], this.appDir);
+      log("building locally from ${image} and tagging ${this.imageTag}...");
+      utils.shell("docker", ["build", "-t", this.imageTag, image], this.appDir);
     } else {
       utils.shell("docker", ["pull", opts.image], this.appDir);
     }
@@ -75,7 +75,7 @@ class Workload impl api.IWorkload {
       }
     }
 
-    dockerRun.push(imageTag);
+    dockerRun.push(this.imageTag);
 
     if let runArgs = this.props.args {
       for a in runArgs {

test/containers.test.w

@@ -22,11 +22,6 @@ new containers.Workload(
   args: ["-text=hello1234"],
 ) as "http-echo";
 
-// new containers.Workload(
-//   image: "./my-app/Dockerfile",
-//   port: 3000
-// );
-
 let getBody = inflight (): str? => {
   if let url = hello.url() {
     return http.get(url).body;

test/ecr.test.w

@@ -2,6 +2,7 @@ bring "../tf-aws/ecr.w" as ecr;
 bring "../utils.w" as utils;
 
 new ecr.Repository(
+  name: "my-repository",
   directory: utils.dirname() + "/test/my-app",
-  tag: "t3"
+  tag: "tag1"
 );

test/local-build.test.w

@@ -9,5 +9,5 @@ let app = new containers.Workload(
 
 test "can access container" {
   let response = http.get("${app.url()}");
-  assert((response.body ?? "") == "Hello, world!");
+  assert((response.body ?? "") == "Hello, Wingnuts!");
 }

utils.w

@@ -8,7 +8,7 @@ class Util {
 
   pub static resolveContentHash(scope: std.IResource, props: utils_api.WorkloadProps): str {
     if !props.image.startsWith("./") {
-      throw "image is not a local docker build: ${props.image}";
+      return props.image;
     }
 
     let sources = props.sources ?? ["**/*"];