- remove unused GA build-extra-tests/action.yml

- cleanup exports in CA
  - remove exports from build-extra-tests CA
  - put exports in build-extra-tests.sh
    - based it on $GITHUB_WORKSPACE
  - changed exports in run-tests CA to use $GITHUB_WORKSPACE
- in common.mk
  - removed TODO comment lines where `$(sim)` had been removed
  - removed commented out lines that used `$(sim)`
- removed unused debugging script1.sh

.github/scripts/build-extra-tests.sh

@@ -3,6 +3,10 @@
 # turn echo on and error on earliest command
 set -ex
 
+export RISCV="$GITHUB_WORKSPACE/riscv-tools-install"
+export LD_LIBRARY_PATH="$RISCV/lib"
+export PATH="$RISCV/bin:$PATH"
+
 # get shared variables
 SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
 source $SCRIPT_DIR/defaults.sh