Set up Sentry error collection via a feature flag

docker/Dockerfile.build

@@ -3,7 +3,7 @@ FROM rust:buster as builder
 
 RUN apt-get update && \
 	apt-get install -y --no-install-recommends \
-	make cmake g++ gcc llvm libclang-dev clang
+	make cmake g++ gcc llvm libclang-dev clang ca-certificates
 
 RUN mkdir /zebra
 WORKDIR /zebra
@@ -18,7 +18,7 @@ RUN rustc -V; cargo -V; rustup -V
 
 COPY . .
 
-RUN cargo test --all --release; cargo build --release
+RUN cargo test --all --release; cargo build --release --features enable-sentry
 
 
 # Runner image
@@ -41,6 +41,8 @@ RUN cat /zebrad.toml
 
 EXPOSE 3000 8233 18233
 
+ENV RUST_LOG debug
 ENV RUST_BACKTRACE full
+ENV SENTRY_DSN https://94059ee72a44420286310990b7c614b5@o485484.ingest.sentry.io/5540918
 
 CMD [ "/zebrad", "-c", "/zebrad.toml", "start" ]

docker/Dockerfile.test

@@ -2,7 +2,7 @@ FROM rust:buster
 
 RUN apt-get update && \
 	apt-get install -y --no-install-recommends \
-	make cmake g++ gcc llvm libclang-dev clang
+	make cmake g++ gcc llvm libclang-dev clang ca-certificates
 
 RUN mkdir /zebra
 WORKDIR /zebra

zebrad/Cargo.toml

@@ -52,6 +52,7 @@ tempdir = "0.3.7"
 zebra-test = { path = "../zebra-test" }
 
 [features]
+enable-sentry = []
 test_sync_to_sapling_mainnet = []
 test_sync_to_sapling_testnet = []
 test_sync_past_sapling_mainnet = []

zebrad/src/bin/zebrad/main.rs

@@ -7,15 +7,11 @@ use zebrad::application::APPLICATION;
 
 /// Boot Zebrad
 fn main() {
-    let _guard = sentry::init((
-        "https://94059ee72a44420286310990b7c614b5@o485484.ingest.sentry.io/5540918",
-        sentry::ClientOptions {
-            debug: true,
-            ..Default::default()
-        },
-    ));
-
-    sentry::capture_message("Hello World!", sentry::Level::Info);
+    if cfg!(feature = "enable-sentry") {
+        // The Sentry default config pulls in the DSN from the `SENTRY_DSN`
+        // environment variable.
+        let _guard = sentry::init(());
+    }
 
     abscissa_core::boot(&APPLICATION);
 }