GHA: Pin version of CMake for all builds

Turns out that "apt install cmake" is useless since
Github installs also CMake but not as a package. So
make sure we control which CMake we get and not
Github.

Switch to get-cmake action (which also installs ninja)
and remove the installation via apt.

Change-Id: Ief11d5d7ccae084c863b50054d4e97c71f57d6f0
Signed-off-by: Frank Lichtenheld <[email protected]>

Author: flichtenheld

.github/workflows/build.yaml

@@ -54,6 +54,7 @@ jobs:
     steps:
       - name: Checkout OpenVPN
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: lukka/get-cmake@56d043d188c3612951d8755da8f4b709ec951ad6 # v3.31.6
       - name: Install vcpkg
         uses: lukka/run-vcpkg@5e0cab206a5ea620130caf672fce3e4a6b5666a1 # v11.5
         with:
@@ -78,10 +79,11 @@ jobs:
       VCPKG_ROOT: ${{ github.workspace }}/vcpkg
     steps:
       - name: Install dependencies
-        run: sudo apt update && sudo apt install -y mingw-w64 unzip cmake ninja-build build-essential wget python3-docutils man2html-base
+        run: sudo apt update && sudo apt install -y mingw-w64 unzip build-essential wget python3-docutils man2html-base
       - name: Checkout OpenVPN
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
+      - uses: lukka/get-cmake@56d043d188c3612951d8755da8f4b709ec951ad6 # v3.31.6
       - name: Restore from cache and install vcpkg
         uses: lukka/run-vcpkg@5e0cab206a5ea620130caf672fce3e4a6b5666a1 # v11.5
         with:
@@ -457,13 +459,14 @@ jobs:
 
     steps:
       - name: Install dependencies
-        run: sudo apt update && sudo apt install -y cmake gcc ninja-build golang make liblzo2-dev libpam0g-dev liblz4-dev linux-libc-dev man2html clang libcmocka-dev python3-docutils python3-jinja2 python3-jsonschema libtool automake autoconf pkg-config libcap-ng-dev libnl-genl-3-dev
+        run: sudo apt update && sudo apt install -y gcc golang make liblzo2-dev libpam0g-dev liblz4-dev linux-libc-dev man2html clang libcmocka-dev python3-docutils python3-jinja2 python3-jsonschema libtool automake autoconf pkg-config libcap-ng-dev libnl-genl-3-dev
       - name: "AWS-LC: checkout"
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           path: aws-lc
           repository: aws/aws-lc
           ref: v1.42.0
+      - uses: lukka/get-cmake@56d043d188c3612951d8755da8f4b709ec951ad6 # v3.31.6
       - name: "AWS-LC: build"
         run: |
           mkdir build