Linux viewer (ReleaseOS) resurrection (#1099)

Co-authored-by: AiraYumi <[email protected]>

.github/workflows/build_linux.yaml

@@ -0,0 +1,47 @@
+name: Linux build example
+on:
+  workflow_dispatch:
+  push:
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    env:
+      AUTOBUILD_ADDRSIZE: 64
+      AUTOBUILD_VARIABLES_FILE: ${{ github.workspace }}/.build-variables/variables
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+
+      - name: Setup python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Checkout build variables
+        uses: actions/checkout@v4
+        with:
+          repository: secondlife/build-variables
+          ref: viewer
+          path: .build-variables
+
+      - name: Checkout master-message-template
+        uses: actions/checkout@v4
+        with:
+          repository: secondlife/master-message-template
+          path: .master-message-template
+
+      - name: Install autobuild and python dependencies
+        run: pip3 install autobuild llsd
+
+      - name: Install Linux dependencies
+        if: runner.os == 'linux'
+        run: sudo apt update && sudo apt install -y libfltk1.3-dev libunwind-dev libgl1-mesa-dev libglu1-mesa-dev libx11-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libxext-dev libxrender-dev libxfixes-dev libxxf86vm-dev libxss-dev libdbus-1-dev libudev-dev libssl-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libfreetype6-dev ninja-build libxft-dev
+
+      - name: Build
+        id: build
+        shell: bash
+        run: |
+          autobuild configure -c ReleaseOS -A64
+          cd build-linux-x86_64 && ninja -k0

.gitignore

@@ -26,7 +26,6 @@ debian/files
 debian/secondlife-appearance-utility*
 debian/secondlife-viewer*
 indra/.distcc
-indra/cmake/*
 indra/out/*
 
 indra/packages/*