chore(ci): temporarily disable arm64 docker builds in CI

[kkovaacs]

One of the new build dependencies of blockifier, starknet-sierra-compile has a build script that does not work in our cross-compile setup due to directly invoking cargo install without the --target flag properly set. This causes the build to fail on arm64.

[kkovaacs]

The actual build error:

#27 196.6   error: linking with `aarch64-linux-gnu-gcc` failed: exit status: 1
#27 196.6     |
#27 196.6     = note: LC_ALL="C" PATH="/usr/local/rustup/toolchains/1.84.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/usr/local/cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "aarch64-linux-gnu-gcc" "-m64" "/tmp/rustc2FyDo9/symbols.o" "/tmp/cargo-install0DU7N5/release/build/proc-macro2-ea3ca02e4c6f08fa/build_script_build-ea3ca02e4c6f08fa.build_script_build.44cb768119f79086-cgu.0.rcgu.o" "/tmp/cargo-install0DU7N5/release/build/proc-macro2-ea3ca02e4c6f08fa/build_script_build-ea3ca02e4c6f08fa.build_script_build.44cb768119f79086-cgu.1.rcgu.o" "/tmp/cargo-install0DU7N5/release/build/proc-macro2-ea3ca02e4c6f08fa/build_script_build-ea3ca02e4c6f08fa.cgpazxeud35mh7444r0yvt1ti.rcgu.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/usr/local/rustup/toolchains/1.84.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-057643b1ee86c6e4.rlib" "/usr/local/rustup/toolchains/1.84.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic
#27 196.6     = note: aarch64-linux-gnu-gcc: error: unrecognized command-line option '-m64'
#27 196.6             
#27 196.6 
#27 196.6   error: could not compile `proc-macro2` (build script) due to 1 previous error
#27 196.6   error: failed to compile `starknet-sierra-compile v2.7.1`, intermediate artifacts can be found at `/tmp/cargo-install0DU7N5`.
#27 196.6   To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
#27 196.6   thread 'main' panicked at /usr/local/cargo/git/checkouts/sequencer-05f416886c73e535/82b1537/crates/starknet_sierra_compile/build.rs:99:9:
#27 196.6   Failed to install starknet-sierra-compile
#27 196.6   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
#27 196.6 warning: build failed, waiting for other jobs to finish...
#27 ...

The build script that is failing: https://github.com/starkware-libs/sequencer/blob/b43ae7764ec4d3da46feb4be2e5e9e371620ef0e/crates/starknet_sierra_compile/build.rs