[win][CI] Convert paths to Windows format before adding to PATH

src/ci/scripts/install-mingw.sh

@@ -42,5 +42,5 @@ if isWindows && isKnownToBeMingwBuild; then
 
     curl -o mingw.7z "${MIRRORS_BASE}/${mingw_archive}"
     7z x -y mingw.7z > /dev/null
-    ciCommandAddPath "$(pwd)/${mingw_dir}/bin"
+    ciCommandAddPath "$(cygpath -m "$(pwd)/${mingw_dir}/bin")"
 fi

src/ci/scripts/install-ninja.sh

@@ -12,7 +12,7 @@ if isWindows; then
     7z x -oninja ninja.zip
     rm ninja.zip
     ciCommandSetEnv "RUST_CONFIGURE_ARGS" "${RUST_CONFIGURE_ARGS} --enable-ninja"
-    ciCommandAddPath "$(pwd)/ninja"
+    ciCommandAddPath "$(cygpath -m "$(pwd)/ninja")"
 elif isMacOS; then
     brew install ninja
 fi

src/ci/scripts/install-sccache.sh

@@ -15,7 +15,7 @@ elif isWindows; then
     mkdir -p sccache
     curl -fo sccache/sccache.exe \
       "${MIRRORS_BASE}/2025-02-24-sccache-v0.10.0-x86_64-pc-windows-msvc.exe"
-    ciCommandAddPath "$(pwd)/sccache"
+    ciCommandAddPath "$(cygpath -m "$(pwd)/sccache")"
 fi
 
 # FIXME: we should probably install sccache outside the containers and then