Add workflow for creating Windows installer

Author: ajtribick

.github/workflows/ci.yml

@@ -0,0 +1,74 @@
+name: Celestia
+
+on:
+  push:
+    branches: [ 1.6.x ]
+    paths: [ src/**, .github/workflows/ci.yml, celestia.sln, celestia.vcxproj, celestia.iss ]
+  pull_request:
+    branches: [ 1.6.x ]
+    paths: [ src/**, .github/workflows/ci.yml, celestia.sln, celestia.vcxproj, celestia.iss ]
+
+jobs:
+  build-windows:
+    name: "Build and package Windows"
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: 'Setup NuGet Credentials'
+      shell: bash
+      run: >
+        $(c:/vcpkg/vcpkg fetch nuget | tail -n 1)
+        sources add
+        -source "https://nuget.pkg.github.com/CelestiaProject/index.json"
+        -storepasswordincleartext
+        -name "GitHub"
+        -username "CelestiaProject"
+        -password "${{ secrets.GITHUB_TOKEN }}"
+
+    - name: 'Add MSBuild to path'
+      uses: microsoft/setup-msbuild@v1.1
+      
+    - name: 'Setup vcpkg integration'
+      shell: pwsh
+      run: |
+        vcpkg integrate install
+      
+    - name: 'Install dependencies (x86)'
+      shell: pwsh
+      run: |
+        vcpkg --triplet=x86-windows install --recurse libpng libjpeg-turbo gettext luajit cspice
+
+    - name: 'Install dependencies (x64)'
+      shell: pwsh
+      run: |
+        vcpkg --triplet=x64-windows install --recurse libpng libjpeg-turbo gettext[tools] luajit cspice
+        echo "$env:VCPKG_INSTALLATION_ROOT/installed/x64-windows/tools/gettext/bin" >> $env:GITHUB_PATH
+
+    - name: 'Checkout source code'
+      uses: actions/checkout@v3
+
+    - name: 'Build Win32'
+      shell: pwsh
+      run: |
+        msbuild celestia.sln /p:Configuration=Release /p:Platform=Win32
+        perl po/translate_resources.pl Win32
+
+    - name: 'Build x64'
+      shell: pwsh
+      run: |
+        msbuild celestia.sln /p:Configuration=Release /p:Platform=x64
+        perl po/translate_resources.pl x64
+
+    - name: 'Create installer'
+      shell: pwsh
+      run: ISCC celestia.iss
+
+    - name: 'Upload artifacts'
+      uses: actions/upload-artifact@v3
+      if: success()
+      with:
+        name: celestia-1.6
+        path: |
+          ${{github.workspace}}/Output/**.exe