Register Windows validation workflows

.github/workflows/windows-hardening.yml

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+name: Windows release hardening
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  registration:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Dispatch this workflow with a ref that contains the Windows hardening implementation."

.github/workflows/windows-port-validation.yml

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+name: Windows port validation
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  registration:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Dispatch this workflow with a ref that contains the Windows port implementation."

.github/workflows/windows-shell.yml

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+name: Windows shell validation
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  registration:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Dispatch this workflow with a ref that contains the Windows shell implementation."