Fix emscripten build ci and deployment (#412)

Author: mcbarton

.github/workflows/deploy-pages.yml

@@ -165,7 +165,7 @@ jobs:
         pushd build
         export CMAKE_PREFIX_PATH=${{ env.PREFIX }} 
         export CMAKE_SYSTEM_PREFIX_PATH=${{ env.PREFIX }} 
-        export SYSROOT_PATH=$HOME/emsdk/upstream/emscripten/cache/sysroot
+        export SYSROOT_PATH=$PWD/emsdk/upstream/emscripten/cache/sysroot
         emcmake cmake \
           -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}          \
           -DCMAKE_PREFIX_PATH=${{ env.PREFIX }}             \

.github/workflows/emscripten.yml

@@ -605,7 +605,7 @@ jobs:
         pushd build
         export CMAKE_PREFIX_PATH=${{ env.PREFIX }} 
         export CMAKE_SYSTEM_PREFIX_PATH=${{ env.PREFIX }} 
-        export SYSROOT_PATH=$HOME/emsdk/upstream/emscripten/cache/sysroot
+        export SYSROOT_PATH=$PWD/emsdk/upstream/emscripten/cache/sysroot
         emcmake cmake \
           -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}          \
           -DCMAKE_PREFIX_PATH=${{ env.PREFIX }}             \