chore: speed up check-features (#481)

.ci/images/build/Dockerfile

@@ -18,14 +18,17 @@ ENV PATH="/usr/local/go/bin:${PATH}"
 RUN curl -s -L -o /tmp/go-1.23.0.tar.gz https://go.dev/dl/go1.23.0.linux-${TARGETARCH}.tar.gz
 RUN tar -C /usr/local -xzf /tmp/go-1.23.0.tar.gz
 
-# Install Protocol Buffers compiler by hand, since Ubuntu 14.04 does not have a recent enough version.
+# Install a number of packages/tools by hand, because the versions in Ubuntu 14.04 are too old or not available at all.
 COPY .ci/install-protoc.sh /
 RUN chmod +x /install-protoc.sh && /install-protoc.sh
 
-# Install awscli by hand, for similar reasons to the Protocol Buffers compiler.
 COPY .ci/install-awscli.sh /
 RUN chmod +x /install-awscli.sh && /install-awscli.sh
 
+RUN curl -s -L -o /tmp/jq https://github.com/jqlang/jq/releases/download/jq-1.7.1/jq-linux-${TARGETARCH} && \
+    mv /tmp/jq /usr/local/bin/jq && \
+    chmod +x /usr/local/bin/jq
+
 # Install Rust and common Cargo tooling that we depend on.
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${RUST_VERSION}
 ENV PATH="/root/.cargo/bin:${PATH}"

Makefile

@@ -185,6 +185,9 @@ check-rust-build-tools:
 ifeq ($(shell command -v cargo >/dev/null || echo not-found), not-found)
 	$(error "Please install Rust: https://www.rust-lang.org/tools/install")
 endif
+ifeq ($(shell command -v jq >/dev/null || echo not-found), not-found)
+	$(error "Please install jq: https://jqlang.org/download/")
+endif
 
 ##@ Running
 
@@ -380,9 +383,12 @@ check-licenses: ## Check that the third-party license file is up to date
 
 .PHONY: check-features
 check-features: check-rust-build-tools cargo-install-cargo-hack
-check-features: ## Check that ADP builds with all possible combinations of feature flags
+check-features: ## Checks that all packages with feature flags can be built with different flag combinations
 	@echo "[*] Checking feature flag compatibility matrix..."
-	@cargo hack check --feature-powerset --tests --quiet
+	@find . -name Cargo.toml | grep -v '^./Cargo.toml' | \
+	xargs -I {} -- cargo read-manifest --manifest-path {} | \
+	jq -r "select(.features | del(.default) | length > 0) | .name" | \
+	xargs -I {} -- cargo hack --feature-powerset --package {} check --tests --quiet
 
 ##@ Testing