Fix arduino-cli path error in workflow

- Explicitly set BINDIR during arduino-cli installation.
- Use absolute path for arduino-cli during core setup to prevent 'command not found' errors.
- Ensure bin directory creation before installation.

Author: jit89

.github/workflows/compile-test.yml

@@ -12,14 +12,16 @@ jobs:
 
       - name: Install Arduino CLI
         run: |
-          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+          mkdir -p $HOME/bin
+          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=$HOME/bin sh
           echo "$HOME/bin" >> $GITHUB_PATH
 
       - name: Setup RP2040 Core
         run: |
-          arduino-cli core update-index
-          arduino-cli core update-index --additional-urls https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
-          arduino-cli core install rp2040:rp2040 --additional-urls https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+          # Use the full path for the first call to ensure it's found
+          $HOME/bin/arduino-cli core update-index
+          $HOME/bin/arduino-cli core update-index --additional-urls https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+          $HOME/bin/arduino-cli core install rp2040:rp2040 --additional-urls https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
 
       - name: Link Library
         run: |