CI: Remove custom Linux deps and SwiftShader

The default environment already includes everything we need to build
all our configurations.

Remove custom SwiftShader setup as lavapipe should now be good enough,
but we need to install the latest one.

.github/workflows/linux_builds.yml

@@ -74,16 +74,13 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Linux dependencies
-        shell: bash
+      # Need newer mesa for lavapipe to work properly.
+      - name: Linux dependencies for tests
+        if: ${{ matrix.proj-test }}
         run: |
-          # Azure repositories are not reliable, we need to prevent azure giving us packages.
-          sudo rm -f /etc/apt/sources.list.d/*
-          sudo cp -f misc/ci/sources.list /etc/apt/sources.list
+          sudo add-apt-repository ppa:kisak/kisak-mesa
           sudo apt-get update
-          # The actual dependencies
-          sudo apt-get install build-essential pkg-config libgl1-mesa-dev libglu-dev \
-              xvfb wget unzip llvm
+          sudo apt-get install -qq mesa-vulkan-drivers
 
       - name: Setup Godot build cache
         uses: ./.github/actions/godot-cache
@@ -138,16 +135,6 @@ jobs:
           ${{ matrix.bin }} --doctool --headless 2>&1 > /dev/null || true
           git diff --color --exit-code && ! git ls-files --others --exclude-standard | sed -e 's/^/New doc file missing in PR: /' | grep 'xml$'
 
-      # Download, unzip and setup SwiftShader library
-      # See https://github.com/godotengine/regression-test-project/releases/tag/_ci-deps for details
-      - name: Download SwiftShader
-        if: ${{ matrix.tests }}
-        run: |
-          wget https://github.com/godotengine/regression-test-project/releases/download/_ci-deps/swiftshader-ubuntu20.04-20211002.zip
-          unzip swiftshader-ubuntu20.04-20211002.zip
-          curr="$(pwd)/libvk_swiftshader.so"
-          sed -i "s|PATH_TO_CHANGE|$curr|" vk_swiftshader_icd.json
-
       # Test 3.x -> 4.x project converter
       - name: Test project converter
         if: ${{ matrix.proj-conv }}
@@ -155,7 +142,7 @@ jobs:
           mkdir converter_test
           cd converter_test
           touch project.godot
-          ../${{ matrix.bin }} --headless --audio-driver Dummy --validate-conversion-3to4
+          ../${{ matrix.bin }} --headless --validate-conversion-3to4
           cd ..
           rm converter_test -rf
 
@@ -171,7 +158,7 @@ jobs:
       - name: Open and close editor (Vulkan)
         if: ${{ matrix.proj-test }}
         run: |
-          VK_ICD_FILENAMES=$(pwd)/vk_swiftshader_icd.json DRI_PRIME=0 xvfb-run ${{ matrix.bin }} --audio-driver Dummy --editor --quit --path test_project 2>&1 | tee sanitizers_log.txt || true
+          xvfb-run ${{ matrix.bin }} --audio-driver Dummy --editor --quit --path test_project 2>&1 | tee sanitizers_log.txt || true
           misc/scripts/check_ci_log.py sanitizers_log.txt
 
       - name: Open and close editor (GLES3)
@@ -184,7 +171,7 @@ jobs:
       - name: Run project
         if: ${{ matrix.proj-test }}
         run: |
-          VK_ICD_FILENAMES=$(pwd)/vk_swiftshader_icd.json DRI_PRIME=0 xvfb-run ${{ matrix.bin }} 40 --audio-driver Dummy --path test_project 2>&1 | tee sanitizers_log.txt || true
+          xvfb-run ${{ matrix.bin }} 40 --audio-driver Dummy --path test_project 2>&1 | tee sanitizers_log.txt || true
           misc/scripts/check_ci_log.py sanitizers_log.txt
 
       # Checkout godot-cpp