try GITHUB_PATH for ci

.github/workflows/build.yml

@@ -66,14 +66,14 @@ jobs:
         npm install --global xpm
         xpm install --global @xpack-dev-tools/arm-none-eabi-gcc@latest
         xpm install --global @xpack-dev-tools/riscv-none-embed-gcc@latest
-        echo "::add-path::`echo $HOME/opt/xPacks/@xpack-dev-tools/arm-none-eabi-gcc/*/.content/bin`"
-        echo "::add-path::`echo $HOME/opt/xPacks/@xpack-dev-tools/riscv-none-embed-gcc/*/.content/bin`"
+        echo `$HOME/opt/xPacks/@xpack-dev-tools/arm-none-eabi-gcc/*/.content/bin` >> $GITHUB_PATH
+        echo `echo $HOME/opt/xPacks/@xpack-dev-tools/riscv-none-embed-gcc/*/.content/bin` >> $GITHUB_PATH
 
         # TI MSP430 GCC
         mkdir -p /tmp/dl/
         [ -f "/tmp/dl/msp430-gcc.tar.bz2" ] || wget --progress=dot:mega $MSP430GCC_URL -O /tmp/dl/msp430-gcc.tar.bz2
         tar -C $HOME -xaf /tmp/dl/msp430-gcc.tar.bz2
-        echo "::add-path::`echo $HOME/msp430-gcc-*_linux64/bin`"
+        echo `echo $HOME/msp430-gcc-*_linux64/bin` >> $GITHUB_PATH
 
     - name: Checkout TinyUSB
       uses: actions/checkout@v2