Faster CI build with correct folder caching

Author: jamwaffles

.circleci/config.yml

@@ -4,7 +4,7 @@ target_steps: &target_steps
   steps:
     - checkout
     - restore_cache:
-        key: v1-ssd1331-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
+        key: v2-ssd1331-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
     - run: sudo apt install -qq linkchecker
     - run: rustup default ${RUST_VERSION:-stable}
     - run: rustup component add rustfmt
@@ -18,57 +18,57 @@ target_steps: &target_steps
         fi
     - run: ./build.sh
     - save_cache:
-        key: v1-ssd1331-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
+        key: v2-ssd1331-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
         paths:
           - ./target
-          - /home/ubuntu/.cargo
+          - /usr/local/cargo/registry
 
 version: 2
 jobs:
   target-arm-unknown-linux-eabi:
     environment:
-      - TARGET: 'arm-unknown-linux-gnueabi'
+      - TARGET: "arm-unknown-linux-gnueabi"
       - DISABLE_EXAMPLES: 1
     <<: *target_steps
 
   target-armv7-unknown-linux-gnueabihf:
     environment:
-      - TARGET: 'armv7-unknown-linux-gnueabihf'
+      - TARGET: "armv7-unknown-linux-gnueabihf"
       - DISABLE_EXAMPLES: 1
     <<: *target_steps
 
   target-x86_64-unknown-linux-gnu:
     environment:
-      - TARGET: 'x86_64-unknown-linux-gnu'
+      - TARGET: "x86_64-unknown-linux-gnu"
       - DISABLE_EXAMPLES: 1
     <<: *target_steps
 
   target-x86_64-unknown-linux-musl:
     environment:
-      - TARGET: 'x86_64-unknown-linux-musl'
+      - TARGET: "x86_64-unknown-linux-musl"
       - DISABLE_EXAMPLES: 1
     <<: *target_steps
 
   target-thumbv6m-none-eabi:
     environment:
-      - TARGET: 'thumbv6m-none-eabi'
+      - TARGET: "thumbv6m-none-eabi"
       # Disable example builds as they target thumbv7 and up
       - DISABLE_EXAMPLES: 1
     <<: *target_steps
 
   target-thumbv7em-none-eabi:
     environment:
-      - TARGET: 'thumbv7em-none-eabi'
+      - TARGET: "thumbv7em-none-eabi"
     <<: *target_steps
 
   target-thumbv7em-none-eabihf:
     environment:
-      - TARGET: 'thumbv7em-none-eabihf'
+      - TARGET: "thumbv7em-none-eabihf"
     <<: *target_steps
 
   target-thumbv7m-none-eabi:
     environment:
-      - TARGET: 'thumbv7m-none-eabi'
+      - TARGET: "thumbv7m-none-eabi"
     <<: *target_steps
 
 build_jobs: &build_jobs
@@ -99,7 +99,7 @@ workflows:
     <<: *build_jobs
     triggers:
       - schedule:
-          cron: '0 0 * * *'
+          cron: "0 0 * * *"
           filters:
             branches:
               only: