Put arduino-cli on PATH before using it

Author: aidangarske

.github/workflows/cross-build.yml

@@ -261,11 +261,17 @@ jobs:
 
       # arduino.yml compiles the sketches inside the *installed* wolfSSL Arduino
       # library, never this repo's Arduino/sketches/*, so nothing built these.
-      - name: Install arduino-cli and the samd core
+      # sudo drops BINDIR, so let the installer use its default $PWD/bin and put
+      # that on PATH -- GITHUB_PATH only applies to later steps, hence the split.
+      - name: Install arduino-cli
+        run: |
+          set -euo pipefail
+          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+          echo "$PWD/bin" >> "$GITHUB_PATH"
+
+      - name: Install the samd core
         run: |
           set -euo pipefail
-          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh \
-            | BINDIR=/usr/local/bin sudo sh
           arduino-cli core update-index
           arduino-cli core install arduino:samd