test: download desired Nimble sources

.github/actions/install_nim/action.yml

@@ -116,10 +116,11 @@ runs:
       shell: ${{ inputs.shell }}
       run: |
         rm -rf nim
+        export NIMBLE_DIR=dist/nimble
         cp ./scripts/build_nim.sh .
         env MAKE="${MAKE_CMD} -j${ncpu}" ARCH_OVERRIDE=${PLATFORM} NIM_COMMIT=${{ inputs.nim_branch }} \
           QUICK_AND_DIRTY_COMPILER=1 QUICK_AND_DIRTY_NIMBLE=1 CC=gcc \
-          bash build_nim.sh nim csources dist/my_nimble NONE
+          bash build_nim.sh nim csources ${NIMBLE_DIR} NimBinaries
 #        nimble install nimble -y
 #        ls -la nim/bin
 #        rm -rf nim/bin/nimble.exe

scripts/build_nim.sh

@@ -94,6 +94,21 @@ nim_needs_rebuilding() {
 	fi
 	popd >/dev/null
 
+  if [[ ! -d "$NIMBLE_DIR" ]]; then
+  	mkdir -p "$NIMBLE_DIR"
+  	pushd "$NIMBLE_DIR"
+  	git clone https://github.com/nim-lang/nimble.git .
+  	git checkout $NIMBLE_COMMIT
+  	# we have to delete .git or koch.nim will checkout a branch tip, overriding our target commit
+  	rm -rf .git
+  	popd
+  fi
+  if [[ "$NIMBLE_DIR" != "dist/nimble" ]]; then
+  	mkdir -p dist
+  	rm -rf dist/nimble
+  	ln -s ../"$NIMBLE_DIR" dist/nimble
+  fi
+
 	if [[ -n "$CI_CACHE" && -d "$CI_CACHE" ]]; then
 		cp -a "$CI_CACHE"/* "$NIM_DIR"/bin/ || true # let this one fail with an empty cache dir
 	fi