ci/docker: add Raspberry Pi picotool and fix GN build

[simbit18]

Summary

• Add prebuilt Raspberry Pi picotool

Fix these warnings

====================================================================================
Configuration/Tool: adafruit-kb2040/audiopack,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2025-09-18 13:11:08
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
tools/Unix.mk:556: "picotool not found in $PATH, it will be sourced from pico-sdk"
Warning: building picotool from pico-sdk will skip USB support! See https://github.com/raspberrypi/pico-sdk/issues/1827
make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
lib/mbedtls submodule needs to be initialized for bintool hashing/signing
mbedtls not found - no signing/hashing support will be built
PICOTOOL_NO_LIBUSB is set - no USB support will be built
Using precompiled enc_bootloader.elf
  [1/1] Normalize adafruit-kb2040/audiopack
====================================================================================
Configuration/Tool: adafruit-kb2040/smp,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2025-09-18 13:12:26
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
tools/Unix.mk:556: "picotool not found in $PATH, it will be sourced from pico-sdk"
  [1/1] Normalize adafruit-kb2040/smp
====================================================================================

• fix GN build with: git checkout 5d0a4153b0bcc86c5a23310d5b648a587be3c56d

While testing the addition of picotool to our docker image,
I noticed that GN with the latest commits from September

https://gn-review.googlesource.com/q/project:gn

fails to build and returns this error:

#18 47.55 [60/299] CXX src/gn/command_format.o
#18 49.02 [61/299] CXX src/gn/command_outputs.o
#18 50.90 [62/299] CXX src/gn/ninja_rust_binary_target_writer.o
#18 52.66 [63/299] CXX src/gn/ninja_outputs_writer.o
#18 53.45 [64/299] CXX src/gn/command_path.o
#18 54.38 [65/299] CXX src/gn/command_refs.o
#18 55.44 [66/299] CXX src/gn/config_values.o
#18 56.74 [67/299] CXX src/gn/compile_commands_writer.o
#18 57.34 [68/299] CXX src/gn/commands.o
#18 57.58 [69/299] CXX src/gn/rust_project_writer.o
#18 57.58 FAILED: src/gn/rust_project_writer.o 
#18 57.58 clang++ -MMD -MF src/gn/rust_project_writer.o.d -I../src -I. -DNDEBUG -O3 -fdata-sections -ffunction-sections -Werror -D_FILE_OFFSET_BITS=64 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -pthread -pipe -fno-exceptions -fno-rtti -fdiagnostics-color -Wall -Wextra -Wno-unused-parameter -Wextra-semi -Wundef -std=c++20 -Wrange-loop-analysis -Wextra-semi-stmt -Wno-deprecated-copy -Wno-implicit-fallthrough -Wno-redundant-move -Wno-unused-variable -Wno-format -Wno-strict-aliasing -Wno-cast-function-type -c ../src/gn/rust_project_writer.cc -o src/gn/rust_project_writer.o
#18 57.58 In file included from ../src/gn/rust_project_writer.cc:5:
#18 57.58 In file included from ../src/gn/rust_project_writer.h:8:
#18 57.58 In file included from ../src/gn/err.h:8:
#18 57.58 In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/memory:63:
#18 57.58 In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_algobase.h:65:
#18 57.58 In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_iterator_base_types.h:71:
#18 57.58 /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/iterator_concepts.h:979:13: error: no matching function for call to '__begin'
#18 57.58         = decltype(ranges::__cust_access::__begin(std::declval<_Tp&>()));
#18 57.58                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For now, as a workaround, I used
git checkout 5d0a4153b0bcc86c5a23310d5b648a587be3c56d
with a commit that does not cause errors in the build.

https://gn-review.googlesource.com/q/project:gn

Impact

Impact on user: NO

Impact on build: NO

Impact on hardware: NO

Impact on documentation: NO

Impact on security: NO

Impact on compatibility: NO

Testing

GitHub

Version
2279 (5d0a4153b0bc)

Commands (type "gn help <command>" for more help):
  analyze: Analyze which targets are affected by a list of files.
  args: Display or configure arguments declared by the build.
  check: Check header dependencies.
  clean: Cleans the output directory.
  clean_stale: Cleans the stale output files from the output directory.
  desc: Show lots of insightful information about a target or config.
  format: Format .gn files.
  gen: Generate ninja files.
  help: Does what you think.
  ls: List matching targets.
  meta: List target metadata collection results.
  outputs: Which files a source/target make.
  path: Find paths between two targets.
  refs: Find stuff referencing a target or file.

picotool v2.2.0 (Linux, GNU-11.4.0, Release)
PICOTOOL:
    Tool for interacting with RP-series device(s) in BOOTSEL mode, or with an
    RP-series binary

Linux (arm-06)