Added grpc health probe binary for readiness and liveness check (flyt…

…eorg#417)

flyteadmin/Dockerfile

@@ -6,13 +6,22 @@
 FROM golang:1.18-alpine3.15 as builder
 RUN apk add git openssh-client make curl
 
+# Create the artifacts directory
+RUN mkdir /artifacts
+
+# Pull GRPC health probe binary for liveness and readiness checks
+RUN GRPC_HEALTH_PROBE_VERSION=v0.4.11 && \
+    wget -qO/artifacts/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
+    chmod +x /artifacts/grpc_health_probe
+
 # COPY only the go mod files for efficient caching
 COPY go.mod go.sum /go/src/github.com/flyteorg/flyteadmin/
 WORKDIR /go/src/github.com/flyteorg/flyteadmin
 
 # Pull dependencies
 RUN go mod download
 
+
 # COPY the rest of the source code
 COPY . /go/src/github.com/flyteorg/flyteadmin/