Use the docker image we just built

build-task.sh

@@ -3,9 +3,6 @@
 set -e
 set -x
 
-curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none -y
-export PATH="$HOME/.cargo/bin:$PATH"
-
 cd something-rust
 cargo build --release
 gzip -c target/release/something-rust > something-rust.gz

decision-task/run.py

@@ -69,19 +69,31 @@ def create_task(name, command, artifacts=None, dependencies=None, env=None, cach
     print("Scheduled %s: %s" % (name, task_id))
     return task_id
 
-create_task(
+image_build_task = create_task(
     "docker image build task",
     "./docker-image-build-task.sh servo-x86_64-linux",
     image="buildpack-deps:trusty-scm",
     features={
         "dind": True,  # docker-in-docker
     },
+    artifacts=[
+        ("image.tar.gz", "/image.tar.gz"),
+    ],
 )
 
 build_task = create_task(
     "build task",
     "./build-task.sh",
-    artifacts=[("executable.gz", "/repo/something-rust/something-rust.gz")],
+    dependencies=[image_build_task],
+    image={
+        "type": "task-image",
+        "taskId": image_build_task,
+        "path": "public/image.tar.gz",
+    },
+
+    artifacts=[
+        ("executable.gz", "/repo/something-rust/something-rust.gz"),
+    ],
 
     # https://docs.taskcluster.net/docs/reference/workers/docker-worker/docs/caches
     # For this to be allowed, I created role

docker-image-build-task.sh

@@ -9,3 +9,4 @@ apt-get update -q
 apt-get install -qy --no-install-recommends docker.io
 docker version
 ./docker/build.sh "$image"
+docker save "$image" | gzip > /image.tar.gz