add GH workflows

.github/workflows/build.yml

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+name: Build
+
+on:
+  workflow_call:
+    outputs:
+      public-release:
+        description: "A boolean value indicating whether this build is recognized as building from a public release branch"
+        value: ${{ jobs.build.outputs.public-release }}
+      sem-ver-1: 
+        description: "The SemVer 1.0 compliant version"
+        value: ${{ jobs.build.outputs.sem-ver-1 }}
+      sem-ver-2: 
+        description: "The SemVer 2.0 compliant version"
+        value: ${{ jobs.build.outputs.sem-ver-2 }}
+      simple-ver: 
+        description: "The three integer version"
+        value: ${{ jobs.build.outputs.version }}
+      version: 
+        description: "The four integer version"
+        value: ${{ jobs.build.outputs.version }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    outputs:
+      # convert PublicRelease to a boolean by comparing the string value to 'true'
+      public-release: ${{ steps.nbgv.outputs.PublicRelease == 'true' }}
+      sem-ver-1: ${{ steps.nbgv.outputs.SemVer1 }}
+      sem-ver-2: ${{ steps.nbgv.outputs.SemVer2 }}
+      simple-ver: ${{ steps.nbgv.outputs.SimpleVersion }}
+      version: ${{ steps.nbgv.outputs.Version }}
+    steps:
+      - name: Checkout
+        uses: actions/[email protected]
+        with:
+          fetch-depth: 0 # fetch-depth 0 needed for NBGV
+      - name: Nerdbank.GitVersioning
+        uses: dotnet/[email protected]
+        id: nbgv
+      - name: Pack Extension
+        run: npx vsce pack ${{ steps.nbgv.outputs.SemVer1 }}
+      - name: Upload Extension Artifact
+        uses: actions/[email protected]
+        with: 
+          name: Extension
+          path: dbos-ttdbg*.vsix

.github/workflows/on_pr.yml

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+name: On Pull Request
+
+on:
+  pull_request:
+    branches:
+      - main
+      - dev
+      - release/*
+    types:
+      - ready_for_review
+      - opened
+      - reopened
+      - synchronize
+
+jobs:
+  build:
+    uses: ./.github/workflows/build.yml

.github/workflows/on_push.yml

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+name: On Push
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+      - release/*
+
+jobs:
+  build:
+    uses: ./.github/workflows/build.yml
+