refactor common code in CI pipelines (#18035)

* refactor CI with nimInternalInstallDepsWindows

* refactor CI with nimInternalBuildKochAndRunCI

* fixup

ci/funs.sh

@@ -31,6 +31,23 @@ nimIsCiSkip(){
   fi
 }
 
+nimInternalInstallDepsWindows(){
+  echo_run mkdir dist
+  echo_run curl -L https://nim-lang.org/download/mingw64.7z -o dist/mingw64.7z
+  echo_run curl -L https://nim-lang.org/download/dlls.zip -o dist/dlls.zip
+  echo_run 7z x dist/mingw64.7z -odist
+  echo_run 7z x dist/dlls.zip -obin
+}
+
+nimInternalBuildKochAndRunCI(){
+  echo_run nim c koch
+  if ! echo_run ./koch runCI; then
+    echo_run echo "runCI failed"
+    echo_run nim r -tools/ci_testresults.nim
+    return 1
+  fi
+}
+
 nimDefineVars(){
   . config/build_config.txt
   nim_csources=bin/nim_csources_$nim_csourcesHash