CI: build GoogleTest 1.14 from source (was 1.11 via apt install)

See #72 (comment)

.build/install-gtest

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -ef
+
+# Build GoogleTest from source and install it
+#
+# See https://github.com/google/googletest/blob/d83fee138a9ae6cb7c03688a2d08d4043a39815d/googletest/README.md#build-with-cmake
+
+gtest_version_tag=v1.14.0
+
+temp_dir=$(mktemp -d)
+function cleanup {
+	rm -rf -- "$temp_dir"
+}
+trap 'cleanup' EXIT
+
+# Download
+git clone --depth 1 -b "$gtest_version_tag" -- https://github.com/google/googletest.git "$temp_dir"
+cd -- "$temp_dir"
+mkdir build
+cd build
+# Configure - build only GoogleTest, not GoogleMock
+cmake .. -DBUILD_GMOCK=OFF
+# Build
+make
+# Install
+sudo make install

.github/workflows/build.yml

@@ -19,9 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: install GoogleTest
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y libgtest-dev
+        run: .build/install-gtest
       - name: install include-what-you-use (iwyu)
         # NB: https://packages.ubuntu.com/jammy/iwyu apparently doesn't declare the `libclang-common-XXX-dev` package it
         # needs as a dependency (without it, `include-what-you-use` fails with "fatal error: 'stddef.h' file not found"
@@ -32,7 +30,9 @@ jobs:
         # want to update to it, we'll have to change this hardcoded version manually and update the
         # `libclang-common-XXX-dev` version accordingly (see
         # https://github.com/include-what-you-use/include-what-you-use/blob/master/README.md#clang-compatibility).
-        run: sudo apt-get install -y iwyu=8.17-1 libclang-common-13-dev
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y iwyu=8.17-1 libclang-common-13-dev
       - name: build
         env:
           CPP_STANDARD: ${{ matrix.cpp-standard }}