Add docker container for C++ format tools

.github/workflows/cpp_format_tools.yml

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+name: C++ Format Tools Docker Image
+on:
+  push:
+    tags: [ '**' ]
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+    paths:
+      - .github/workflows/cpp_format_tools.yml
+      - cpp_format_tools/*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Build the Docker image
+      run: docker build cpp_format_tools/. -t cpp_format_tools
+
+    - name: Login to GitHub Package Registry
+      if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Push the Docker image
+      if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')
+      run: |
+        function tag_and_push {
+          docker tag cpp_format_tools "otel/cpp_format_tools:${1}" && docker push "otel/cpp_format_tools:${1}"
+        }
+        if [[ "${GITHUB_REF}" == "refs/heads/main" ]]; then
+          tag_and_push "latest"
+        elif [[ "${GITHUB_REF}" =~ refs/tags/v[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+            TAG="${GITHUB_REF#"refs/tags/v"}"
+            tag_and_push "${TAG}"
+        else
+          tag_and_push "${GITHUB_REF#"refs/tags/"}"
+        fi

cpp_format_tools/Dockerfile

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+ARG ALPINE_VERSION=3.13
+
+ARG BUILDIFIER_VERSION=3.5.0
+ARG CLANG_VERSION=10.0.1-r0
+ARG CMAKE_FORMAT_VERSION=0.6.13
+
+FROM alpine:${ALPINE_VERSION}
+LABEL maintainer="The OpenTelemetry Authors"
+RUN apk update
+
+ARG CLANG_VERSION
+RUN apk add --no-cache clang=${CLANG_VERSION} python3 py3-pip git curl
+
+ARG CMAKE_FORMAT_VERSION
+RUN pip3 install cmake_format==${CMAKE_FORMAT_VERSION}
+
+ARG BUILDIFIER_VERSION
+RUN curl -L -o /usr/local/bin/buildifier https://github.com/bazelbuild/buildtools/releases/download/${BUILDIFIER_VERSION}/buildifier
+RUN chmod +x /usr/local/bin/buildifier
+
+COPY format.sh /
+ENTRYPOINT ["sh", "/format.sh"]

cpp_format_tools/README.md

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+# C++ Format Tools + Docker
+
+A lightweight Docker image, published as otel/cpp_format_tools to Docker Hub,
+with all dependencies and tools built-in, to format C++ code.
+
+## What's included in the image
+
+- clang-format
+- cmake-format
+- buildifier
+
+## Usage
+
+```bash
+docker run --rm --privileged=true --volume ${PWD}:/otel otel/cpp_format_tools
+```

cpp_format_tools/format.sh

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+#!/bin/bash
+
+set -e
+
+FIND="find /otel -name third_party -prune -o -name tools -prune -o -name .git -prune -o -name _deps -prune -o -name .build -prune -o -name out -prune -o -name .vs -prune -o"
+
+echo "Running sed: "
+echo "-> Correct common miscapitalizations."
+sed -i 's/Open[t]elemetry/OpenTelemetry/g' $($FIND -type f -print)
+echo "-> No CRLF line endings, except Windows files."
+sed -i 's/\r$//' $($FIND -name '*.ps1' -prune -o \
+  -name '*.cmd' -prune -o -type f -print)
+echo "-> No trailing spaces."
+sed -i 's/ \+$//' $($FIND -type f -print)
+
+echo "Running clang-format $(clang-format --version 2>&1)."
+clang-format -i -style=file $($FIND -name '*.cc' -print -o -name '*.h' -print)
+
+echo "Running cmake-format $(cmake-format --version 2>&1)."
+cmake-format -i $($FIND -name 'CMakeLists.txt' -print -name '*.cmake' -print -name '*.cmake.in' -print)
+
+echo "Running buildifier"
+buildifier $($FIND -name WORKSPACE -print -o -name BUILD -print -o -name '*.BUILD' -o -name '*.bzl' -print)