Update Dockerfile to install openssl dev dependencies.

Unfortunately, kube doesn't work with rustls when talking to local
clusters: kube-rs/kube#153

Thankfully, openssl is only a dependency if the test-utils feature is
enabled, so our release builds will not depend on openssl.
Unfortunately, that means that our release builds will be interacting
with Kubernetes using a different TLS library than our tests use.

Dockerfile

@@ -1,6 +1,6 @@
 FROM rust:1.62.0-alpine as builder
 ARG BINARY=aggregator
-RUN apk add libc-dev
+RUN apk add libc-dev openssl-dev
 
 WORKDIR /src
 COPY Cargo.toml /src/Cargo.toml

janus_server/Cargo.toml

@@ -7,11 +7,14 @@ publish = false
 rust-version = "1.60"
 
 [features]
+default = ["kube-rustls"]
 tokio-console = ["dep:console-subscriber"]
 jaeger = ["dep:tracing-opentelemetry", "dep:opentelemetry-jaeger"]
 otlp = ["dep:tracing-opentelemetry", "dep:opentelemetry-otlp", "dep:opentelemetry-semantic-conventions", "dep:tonic"]
 prometheus = ["dep:opentelemetry-prometheus", "dep:prometheus"]
 test-util = ["janus_core/test-util", "dep:lazy_static", "dep:testcontainers"]
+kube-rustls = ["kube/rustls-tls"]
+kube-openssl = ["kube/openssl-tls"]
 
 [dependencies]
 anyhow = "1"
@@ -30,7 +33,7 @@ hyper = "0.14.19"
 itertools = "0.10.3"
 janus_core = { path = "../janus_core", features = ["database"] }
 k8s-openapi = { version = "*", features = ["v1_20"] }
-kube = "0.65.0"
+kube = { version = "0.65.0", default-features = false, features = ["client"] }
 lazy_static = { version = "1", optional = true }
 num_enum = "0.5.6"
 opentelemetry = { version = "0.17.0", features = ["metrics", "rt-tokio"] }
@@ -67,7 +70,7 @@ warp = { version = "^0.3", features = ["tls"] }
 assert_matches = "1"
 hex = { version = "0.4.3", features = ["serde"] }
 hyper = "0.14.19"
-janus_server = { path = ".", features = ["test-util"] }
+janus_server = { path = ".", default-features = false, features = ["kube-openssl", "test-util"] }
 libc = "0.2.126"
 mockito = "0.31.0"
 serde_test = "1.0.139"