ci: add scripts to download build tools

.gitlab/ci/cmake.sh

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+#!/bin/sh
+
+set -e
+
+readonly version="3.17.2"
+readonly sha256sum="dc57f3cc448ca67fc8776b4ad4c22b087b9c6a8e459938b9622b8c7f4ef6b21e"
+readonly filename="cmake-$version-Linux-x86_64"
+readonly tarball="$filename.tar.gz"
+
+cd .gitlab
+
+echo "$sha256sum  $tarball" > cmake.sha256sum
+curl -OL "https://github.com/Kitware/CMake/releases/download/v$version/$tarball"
+sha256sum --check cmake.sha256sum
+tar xf "$tarball"
+mv "$filename" cmake

.gitlab/ci/ninja.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+readonly version="1.10.0"
+readonly sha256sum="6566836ddf3d72ca06685b34814e0c6fa0f0943542d651d0dab3150f10307c82"
+readonly filename="ninja-linux"
+readonly tarball="$filename.zip"
+
+cd .gitlab
+
+echo "$sha256sum  $tarball" > ninja.sha256sum
+curl -OL "https://github.com/ninja-build/ninja/releases/download/v$version/$tarball"
+sha256sum --check ninja.sha256sum
+./cmake/bin/cmake -E tar xf "$tarball"

.gitlab/ci/sccache.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+
+readonly version="0.2.12"
+readonly sha256sum="26fd04c1273952cc2a0f359a71c8a1857137f0ee3634058b3f4a63b69fc8eb7f"
+readonly filename="sccache-$version-x86_64-unknown-linux-musl"
+readonly tarball="$filename.tar.gz"
+
+cd .gitlab
+
+echo "$sha256sum  $tarball" > sccache.sha256sum
+curl -OL "https://github.com/mozilla/sccache/releases/download/$version/$tarball"
+sha256sum --check sccache.sha256sum
+tar xf "$tarball"
+mv "$filename/sccache" .