[nrf noup] REVERTME: ci: Bump to use CMake 3.20.5

NOTE TO MAINTAINERS:

   This should be reverted before the next upmerge.

   It was originally cherry picked from commit
   e78cb74 ("ci: Bump to use CMake
   3.20.5") upstream, but manual conflict resolution was required.
   Rather than bring in other additional patches, we're just
   replicating its effect here in NCS for CI purposes. We'll get it
   back from upstream after reverting when we next synchronzie.

With CMake minimum required as 3.20.0 we update CI to use docker image
v0.18.2, which contains CMake 3.20.5.

For doc builds we fetch the same CMake v3.20.5 but using pip as the doc
build doesn't use the docker image.

The main reason for increasing CMake version is better toolchain
support.
The decision to bump the CMake version was taken by the Toolchain WG.

Better toolchain support is added in the following CMake versions:
- armclang, CMake 3.15
- Intel oneAPI, CMake 3.20
- IAR, CMake 3.15 and 3.20

Signed-off-by: Torsten Rasmussen <[email protected]>
Signed-off-by: Martí Bolívar <[email protected]>

Author: tejlmand

.buildkite/pipeline.yml

@@ -10,7 +10,7 @@ steps:
       manual: true
     plugins:
       - docker#v3.5.0:
-          image: "zephyrprojectrtos/ci:v0.17.1"
+          image: "zephyrprojectrtos/ci:v0.18.2"
           propagate-environment: true
           volumes:
             - "/var/lib/buildkite-agent/git-mirrors:/var/lib/buildkite-agent/git-mirrors"

.github/workflows/bsim.yaml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: bsim-build-cancel
     container:
-      image: zephyrprojectrtos/ci:v0.17.1
+      image: zephyrprojectrtos/ci:v0.18.2
       options: '--entrypoint /bin/bash'
     env:
       ZEPHYR_TOOLCHAIN_VARIANT: zephyr

.github/workflows/clang.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: clang-build-cancel
     container:
-      image: zephyrprojectrtos/ci:v0.17.1
+      image: zephyrprojectrtos/ci:v0.18.2
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false

.github/workflows/doc-build.yml

@@ -19,6 +19,11 @@ on:
     - 'scripts/dts/**'
     - 'scripts/requirements-doc.txt'
 
+env:
+  # The latest CMake available directly with apt is 3.18, but we need >=3.20
+  # so we fetch that through pip.
+  CMAKE_VERSION: 3.20.5
+
 jobs:
   doc-build:
     name: "Documentation Build"
@@ -47,6 +52,7 @@ jobs:
         sudo pip3 install -U setuptools wheel pip
         pip3 install -r scripts/requirements-doc.txt
         pip3 install west==0.11.0
+        pip3 install cmake==${CMAKE_VERSION}
 
     - name: west setup
       run: |

.github/workflows/errno.yml

@@ -8,7 +8,7 @@ jobs:
   check-errno:
     runs-on: ubuntu-latest
     container:
-      image: zephyrprojectrtos/ci:v0.17.1
+      image: zephyrprojectrtos/ci:v0.18.2
 
     steps:
       - name: checkout