test: add a python container to wasmtime shim for testing

this commit adds a python container in the test directory.
It also adds a few commands in the makefile to build the python
flask app into a container, load into the kind cluster for testing.
Eventually the wasmtime tests will have both python container and
a wasm contaienr running in a pod.

Signed-off-by: jiaxiao zhou <[email protected]>

Makefile

@@ -67,10 +67,16 @@ bin/kind: test/k8s/Dockerfile
 test/k8s/_out/img: test/k8s/Dockerfile Cargo.toml Cargo.lock $(shell find . -type f -name '*.rs')
 	mkdir -p $(@D) && $(DOCKER_BUILD) -f test/k8s/Dockerfile --iidfile=$(@) --load  .
 
+.PHONY: test/py-flask
+test/py-flask:
+	docker build -t py-flask-app:latest -f $@/Dockerfile $@
+	mkdir -p $@/out && docker save -o $@/out/img.tar py-flask-app:latest 
+
 .PHONY: test/k8s/cluster
-test/k8s/cluster: target/wasm32-wasi/$(TARGET)/img.tar bin/kind test/k8s/_out/img bin/kind
+test/k8s/cluster: target/wasm32-wasi/$(TARGET)/img.tar bin/kind test/k8s/_out/img bin/kind test/py-flask
 	bin/kind create cluster --name $(KIND_CLUSTER_NAME) --image="$(shell cat test/k8s/_out/img)" && \
 	bin/kind load image-archive --name $(KIND_CLUSTER_NAME) $(<)
+	bin/kind load image-archive --name $(KIND_CLUSTER_NAME) test/py-flask/out/img.tar
 
 .PHONY: test/k8s
 test/k8s: test/k8s/cluster

test/k8s/deploy.yaml

@@ -24,4 +24,7 @@ spec:
       containers:
       - name: demo
         image: ghcr.io/containerd/runwasi/wasi-demo-app:latest
+        imagePullPolicy: Never
+      - name: py-demo
+        image: py-cmd-app:v1
         imagePullPolicy: Never

test/py-flask/Dockerfile

@@ -0,0 +1,20 @@
+# syntax=docker/dockerfile:1.4
+FROM --platform=$BUILDPLATFORM python:3.10-alpine AS builder
+
+WORKDIR /app
+
+COPY requirements.txt /app
+RUN --mount=type=cache,target=/root/.cache/pip \
+    pip3 install -r requirements.txt
+
+COPY . /app
+
+ENTRYPOINT ["python3"]
+CMD ["app.py"]
+
+FROM builder as dev-envs
+
+RUN <<EOF
+apk update
+apk add git
+EOF

test/py-flask/app.py

@@ -0,0 +1,9 @@
+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+	return "Hello World!"
+
+if __name__ == '__main__':
+	app.run(host='0.0.0.0', port=8000)

test/py-flask/requirements.txt

@@ -0,0 +1 @@
+flask