chore: Remove old travis docker scripts.

These aren't useful anymore. We don't have travis anymore, so there's no
need to simulate the travis CI environment.

other/docker/cmake/Dockerfile

@@ -1,14 +0,0 @@
-################################################
-# cmake-linux
-FROM localbuild/travis:1.0.0
-
-# Copy minimal files to run "cmake-linux install", so we can avoid rebuilding
-# astyle and other things when only source files change.
-RUN mkdir -p /home/travis/build/c-toxcore /home/travis/cache
-WORKDIR /home/travis/build/c-toxcore
-COPY --chown=travis:travis c-toxcore/.travis/ /home/travis/build/c-toxcore/.travis/
-RUN .travis/cmake-linux install
-
-# Now copy the rest of the sources and run the build.
-COPY --chown=travis:travis . /home/travis/build/
-RUN .travis/cmake-linux script

other/docker/run-ci

@@ -1,21 +0,0 @@
-#!/bin/bash
-
-set -eux
-
-STAGE="${1-cmake}"
-
-readarray -t FILES <<<"$(git ls-files | sed -e 's,^,c-toxcore/,')"
-
-FILES+=(c-toxcore/.git)
-
-if [ -f .git ]; then
-  FILES+=(.git/modules/c-toxcore)
-fi
-
-cd ..
-tar -c "${FILES[@]}" |
-  docker build -f "c-toxcore/other/docker/travis/Dockerfile" \
-    -t localbuild/travis:1.0.0 -
-tar -c "${FILES[@]}" |
-  docker build -f "c-toxcore/other/docker/$STAGE/Dockerfile" \
-    -t "localbuild/$STAGE:1.0.0" -

other/docker/travis/Dockerfile

@@ -1,65 +0,0 @@
-# This Docker build emulates roughly what Travis CI is doing. It is not exactly
-# the same (different tool versions) and success in this image may not
-# necessarily mean success on Travis. This image is also not automatically
-# tested, so it may get out of date. Send PRs if you use it and it's broken.
-#
-# For one, we use bionic, not xenial, because xenial's clang is way too old.
-FROM ubuntu:16.04
-
-# Travis environment.
-RUN apt-get update && apt-get install --no-install-recommends -y \
- apt-transport-https \
- build-essential \
- ca-certificates \
- curl \
- git \
- pkg-config \
- python-pip \
- python-setuptools \
- python3 \
- software-properties-common \
- wget \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
-
-SHELL ["/bin/bash", "-o", "pipefail", "-c"]
-RUN curl https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
- && apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main" \
- && apt-get update && apt-get install --no-install-recommends -y \
- clang-6.0 \
- clang-format-6.0 \
- llvm-6.0 \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
-
-RUN ls /usr/bin/clang-6.0 && ln -s /usr/bin/clang-6.0 /usr/bin/clang \
- && ls /usr/bin/clang++-6.0 && ln -s /usr/bin/clang++-6.0 /usr/bin/clang++ \
- && ls /usr/bin/clang-format-6.0 && ln -s /usr/bin/clang-format-6.0 /usr/bin/clang-format \
- && ls /usr/bin/opt-6.0 && ln -s /usr/bin/opt-6.0 /usr/bin/opt
-
-# Bionic's cmake is too old.
-RUN pip install --upgrade pip cmake
-
-# .travis.yml
-RUN apt-get update && apt-get install --no-install-recommends -y \
- libconfig-dev \
- libgtest-dev \
- libopus-dev \
- libsodium-dev \
- libvpx-dev \
- ninja-build \
- pylint3 \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
-
-# Set up travis user.
-RUN groupadd -r -g 1000 travis \
- && useradd --no-log-init -r -g travis -u 1000 travis \
- && mkdir -p /src/workspace /home/travis \
- && chown travis:travis /home/travis
-USER travis
-
-# Set up environment.
-ENV CC=gcc CXX=g++ \
-PATH=/home/travis/.local/bin:$PATH \
-TRAVIS_REPO_SLUG=TokTok/c-toxcore