Standardizes loadgen behavior for Istio mTLS=STRICT (#279)

* Adds liveness probe annotation, moves loadgen initcontainer into main

* cleanup

* cleanup

* updated wrong manifests

* respond to comments

src/loadgenerator/Dockerfile

@@ -15,4 +15,7 @@ COPY --from=builder /install /usr/local
 
 COPY . .
 RUN chmod +x ./loadgen.sh
+RUN apt-get -qq update \
+    && apt-get install -y --no-install-recommends \
+        curl
 ENTRYPOINT ./loadgen.sh

src/loadgenerator/loadgen.sh

@@ -24,4 +24,13 @@ if [[ -z "${FRONTEND_ADDR}" ]]; then
 fi
 
 set -x
+
+# if one request to the frontend fails, then exit
+STATUSCODE=$(curl --silent --output /dev/stderr --write-out "%{http_code}" http://${FRONTEND_ADDR})
+if test $STATUSCODE -ne 200; then
+    echo "Error: Could not reach frontend - Status code: ${STATUSCODE}"
+    exit 1
+fi
+
+# else, run loadgen
 locust --host="http://${FRONTEND_ADDR}" --no-web -c "${USERS:-10}" 2>&1