Install openssl on Windows in GH Actions

.github/workflows/ci.yaml

@@ -5,6 +5,9 @@ on:
 
 name: CI
 
+env:
+  VCPKGRS_DYNAMIC: 1
+
 jobs:
   rust_tests:
     name: Run rust tests
@@ -15,8 +18,16 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@master
-      - name: Convert symlinks to hardlink (windows only)
-        run: powershell.exe scripts/symlinks-to-hardlinks.ps1
+      - name: Cache Windows
+        uses: actions/cache@v1
+        with:
+          key: vcpkg
+          path: 'C:/vcpkg'
+        if: runner.os == 'Windows'
+      - name: Set up the Windows environment
+        run: |
+          powershell.exe scripts/symlinks-to-hardlinks.ps1
+          powershell.exe scripts/install-openssl.ps1
         if: runner.os == 'Windows'
       - name: Cache cargo dependencies
         uses: actions/cache@v1
@@ -40,8 +51,16 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@master
-      - name: Convert symlinks to hardlink (windows only)
-        run: powershell.exe scripts/symlinks-to-hardlinks.ps1
+      - name: Cache Windows
+        uses: actions/cache@v1
+        with:
+          key: vcpkg
+          path: 'C:/vcpkg'
+        if: runner.os == 'Windows'
+      - name: Set up the Windows environment
+        run: |
+          powershell.exe scripts/symlinks-to-hardlinks.ps1
+          powershell.exe scripts/install-openssl.ps1
         if: runner.os == 'Windows'
       - name: Cache cargo dependencies
         uses: actions/cache@v1