CI: Get Turbo C 2.01 and maybe decrypt

Notes:
  1/ Set the Github Actions variables as follows
      a) TC201_ARCHIVE_PATHNAME to the URL without final component.
      b) TC201_ARCHIVE_FILENAME to the name of the file to be downloaded.
  2/ If the archive is GPG symmetrically encrypted set the following
    secret to your own freecom Github repository secrets to get your PRs
    built with Turbo C, otherwise they will only be checked fully
    **after** they have been merged.
      a) TC201_ARCHIVE_PASSPHRASE to the decryption passphrase.

.github/workflows/ci-build.yml

@@ -20,6 +20,10 @@ jobs:
 
     - name: prerequisites
       run: ./ci_prereq.sh
+      env:
+          TC201_ARCHIVE_PATHNAME: ${{ vars.TC201_ARCHIVE_PATHNAME }}
+          TC201_ARCHIVE_FILENAME: ${{ vars.TC201_ARCHIVE_FILENAME }}
+          TC201_ARCHIVE_PASSPHRASE: ${{ secrets.TC201_ARCHIVE_PASSPHRASE }}
 
     - name: build
       run: ./ci_build.sh

ci_prereq.sh

@@ -49,6 +49,12 @@ DEVEL=${IBIBLIO_PATH}/devel
 #    get Watcom for DOS
 [ -f watcomc.zip ] || wget --no-verbose ${DEVEL}/watcomc.zip
 
+#    get Turbo C 2.01 (maybe encrypted) tar file
+if [ -n "${TC201_ARCHIVE_FILENAME}" ] && [ ! -f ${TC201_ARCHIVE_FILENAME} ] ; then
+   echo "Downloading Turbo C 2.01"
+   wget --no-verbose ${TC201_ARCHIVE_PATHNAME}/${TC201_ARCHIVE_FILENAME}
+fi
+
 # Unpack the DOS binaries
 mkdir -p ${HOME}/.dosemu/drive_c
 cd ${HOME}/.dosemu/drive_c && (
@@ -74,4 +80,15 @@ cd ${HOME}/.dosemu/drive_c && (
 
   unzip -L -q ${HERE}/watcomc.zip
   echo PATH to watcom binaries is 'c:/devel/watcomc/binw'
+
+  # Turbo C
+  if [ -f ${HERE}/${TC201_ARCHIVE_FILENAME} ] && [ -n "${TC201_ARCHIVE_PASSPHRASE}" ] ; then
+    echo Decrypting and unpacking Turbo C 2.01
+    echo "${TC201_ARCHIVE_PASSPHRASE}" | gpg --decrypt --batch --passphrase-fd 0 ${HERE}/${TC201_ARCHIVE_FILENAME} | tar -jxf -
+  elif [ -f ${HERE}/${TC201_ARCHIVE_FILENAME} ] ; then
+    echo Unpacking Turbo C 2.01
+    tar -jxf ${HERE}/${TC201_ARCHIVE_FILENAME}
+  else
+    echo No Turbo C 2.01 archive available
+  fi
 )