Adding raspi example build

Author: PatrickLang

.circleci/config.yml

@@ -31,7 +31,7 @@ cross_steps: &cross_steps
   steps:
     - checkout
     - restore_cache:
-        key: v2-ssd1306-raspi-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
+        key: v2-ssd1306-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
     - run: rustup self update
     - run: sudo apt install -qq linkchecker
     - run: rustup default ${RUST_VERSION:-stable}
@@ -40,9 +40,9 @@ cross_steps: &cross_steps
     - run: cargo install cross
     - run: |
         cd {{ .Environment.EXAMPLE_PATH }}
-        cross build --release --target {{ .Environment.CIRCLE_JOB }}
+        cross build --release --target {{ .Environment.TARGET }}
     - save_cache:
-        key: v2-ssd1306-raspi-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
+        key: v2-ssd1306-{{ .Environment.CIRCLE_JOB }}-{{ checksum "Cargo.toml" }}
         paths:
           - ./target
           - /usr/local/cargo/registry