CI scripts stop using deprecated set-path

They were disabled sometime recently, breaking the CI

Author: nagisa

.github/workflows/psm.yml

@@ -70,12 +70,12 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Add MSYS2 to the PATH
-        run: echo "::add-path::c:/msys64/bin"
+        run: echo "c:/msys64/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
       - name: Add 32-bit mingw-w64 to the PATH
-        run: echo "::add-path::c:/msys64/mingw32/bin"
+        run: echo "c:/msys64/mingw32/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
         if: startsWith(matrix.rust_target, 'i686')
       - name: Add 64-bit mingw-w64 to the PATH
-        run: echo "::add-path::c:/msys64/mingw64/bin"
+        run: echo "c:/msys64/mingw64/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
         if: startsWith(matrix.rust_target, 'x86_64')
       - name: Install Rust nightly
         uses: actions-rs/toolchain@v1

.github/workflows/stacker.yml

@@ -52,12 +52,12 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Add MSYS2 to the PATH
-        run: echo "::add-path::c:/msys64/bin"
+        run: echo "c:/msys64/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
       - name: Add 32-bit mingw-w64 to the PATH
-        run: echo "::add-path::c:/msys64/mingw32/bin"
+        run: echo "c:/msys64/mingw32/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
         if: startsWith(matrix.rust_target, 'i686')
       - name: Add 64-bit mingw-w64 to the PATH
-        run: echo "::add-path::c:/msys64/mingw64/bin"
+        run: echo "c:/msys64/mingw64/bin" | Out-File -FilePath $env:GITHUB_PATH -Append
         if: startsWith(matrix.rust_target, 'x86_64')
       - name: Install Rust nightly
         uses: actions-rs/toolchain@v1
@@ -201,7 +201,6 @@ jobs:
       - run: rustup target add wasm32-wasi
       - run: |
           curl -Lf https://github.com/bytecodealliance/wasmtime/releases/download/v0.19.0/wasmtime-v0.19.0-x86_64-linux.tar.xz | tar xJf - -C ${{ runner.tool_cache }}
-          echo ::add-path::${{ runner.tool_cache }}/wasmtime-v0.19.0-x86_64-linux
-          echo ::set-env name=CARGO_BUILD_TARGET::wasm32-wasi
-          echo ::set-env name=CARGO_TARGET_WASM32_WASI_RUNNER::wasmtime run --
+          echo "${{ runner.tool_cache }}/wasmtime-v0.19.0-x86_64-linux" >> $GITHUB_PATH
+          echo "CARGO_TARGET_WASM32_WASI_RUNNER=wasmtime run --" >> $GITHUB_ENV
       - run: cargo test --target wasm32-wasi --all -- --nocapture