add CI colors, comment on speedups

.github/workflows/build.yml

@@ -1,5 +1,10 @@
 name: Build sample material
 
+env:
+  CARGO_TERM_COLOR: always     # We want colors in our CI output
+  CARGO_INCREMENTAL: 0         # Don't waste time writing out incremental build files
+  CARGO_PROFILE_TEST_DEBUG: 0  # These are thrown away anyways, don't produce them
+
 on:
   push:
   pull_request:
@@ -17,8 +22,10 @@ jobs:
         with:
           tool: [email protected],[email protected],[email protected],[email protected]
 
+        # `minimal` profile avoids downloading `rustdocs`, `clippy`, etc.
       - name: Install targets
         run: |
+          rustup set profile minimal
           rustup target add thumbv7em-none-eabihf
           rustup component add rust-src
           rustup component add rustfmt
@@ -51,4 +58,5 @@ jobs:
         with:
           artifacts: "./rust-exercises-${{ env.slug }}.zip,./rust-exercises-${{ env.slug }}/nrf52-code/boards/dongle-fw/*-fw"
           allowUpdates: true
-          updateOnlyUnreleased: true
+          updateOnlyUnreleased: true
+

.github/workflows/weekly-canary-build.yml

@@ -1,5 +1,10 @@
 name: Weekly Canary Build
 
+env:
+  CARGO_TERM_COLOR: always     # We want colors in our CI output
+  CARGO_INCREMENTAL: 0         # Don't waste time writing out incremental build files
+  CARGO_PROFILE_TEST_DEBUG: 0  # These are thrown away anyways, don't produce them
+
 on:
     schedule:
         - cron: '0 0 * * Mon'
@@ -21,8 +26,10 @@ jobs:
         with:
           tool: [email protected],[email protected],[email protected],[email protected]
 
+        # `minimal` profile avoids downloading `rustdocs`, `clippy`, etc.
       - name: Install targets, update, set default Rust
         run: |
+          rustup profile set minimal
           rustup update ${{ matrix.rust-channel }}
           rustup default ${{ matrix.rust-channel }}
           rustup component add rust-src

build.sh

@@ -6,35 +6,35 @@ OUTPUT_NAME=${1:-./output}
 
 # Build and test the solutions
 pushd exercise-solutions
-cargo test
+cargo test --frozen
 cargo test --examples
 cargo fmt --check
 pushd connected-mailbox
-cargo test
+cargo test --frozen
 cargo fmt --check
 popd
 pushd multi-threaded-mailbox
-cargo test
+cargo test --frozen
 cargo fmt --check
 popd
 popd
 pushd qemu-code
 pushd uart-driver
 # Build from source because armv8r-none-eabihf isn't Tier 2
-RUSTC_BOOTSTRAP=1 cargo build -Zbuild-std=core
+RUSTC_BOOTSTRAP=1 cargo build -Zbuild-std=core --frozen
 popd
 popd
 pushd nrf52-code
 pushd boards/dk
-cargo build --target=thumbv7em-none-eabihf
+cargo build --target=thumbv7em-none-eabihf --release
 cargo fmt --check
 popd
 pushd boards/dk-solution
-cargo build --target=thumbv7em-none-eabihf
+cargo build --target=thumbv7em-none-eabihf --release
 cargo fmt --check
 popd
 pushd boards/dongle
-cargo build --target=thumbv7em-none-eabihf
+cargo build --target=thumbv7em-none-eabihf --release
 cargo fmt --check
 popd
 pushd radio-app
@@ -45,7 +45,7 @@ for i in usb-lib-solutions/*; do
     pushd $i
     cargo build --target=thumbv7em-none-eabihf --release
     cargo fmt --check
-    cargo test
+    cargo test --locked
     popd
 done
 pushd usb-lib 
@@ -61,7 +61,7 @@ cargo build --target=thumbv7em-none-eabihf --release
 cargo fmt --check
 popd
 pushd consts
-cargo build
+cargo build --frozen
 cargo fmt --check
 popd
 pushd puzzle-fw
@@ -74,9 +74,9 @@ cargo fmt --check
 popd
 popd
 
-# Only build the templates (they will panic at run-time due to the use of todo!)
+# Only check the templates (they will panic at run-time due to the use of todo!)
 pushd exercise-templates
-cargo build
+cargo check --frozen
 cargo fmt --check
 popd