ci: fix checking CI_GITHUB_API_KEY, refactoring (#5496)

* ci: fix checking for presence of CI_GITHUB_API_KEY

CI_GITHUB_API_KEY is always set when evaluating job include/exclude conditions, and it only gets removed when the job starts. Move the check into the script.

* ci: split build jobs into separate shell scripts

tests/common.sh

@@ -126,37 +126,6 @@ function install_ide()
     export PATH="$ide_path:$core_path/tools/xtensa-lx106-elf/bin:$PATH"
 }
 
-function build_docs()
-{
-    SPHINXOPTS="-W" make html
-}
-
-function run_host_tests()
-{
-    pushd host
-    make CI
-    make clean-objects
-    popd
-}
-
-function build_package()
-{
-    export PKG_URL=https://github.com/esp8266/Arduino/releases/download/$TRAVIS_TAG/esp8266-$TRAVIS_TAG.zip
-    export DOC_URL=https://arduino-esp8266.readthedocs.io/en/$TRAVIS_TAG/
-    ./build_boards_manager_package.sh
-}
-
-function build_boards()
-{
-    echo -e "travis_fold:start:build_boards"
-    tools/boards.txt.py --boardsgen --ldgen --packagegen --docgen
-    git diff --exit-code -- boards.txt \
-                            doc/boards.rst \
-                            tools/sdk/ld/
-    git diff --exit-code -w -- package/package_esp8266com_index.template.json
-    echo -e "travis_fold:end:build_boards"
-}
-
 function install_platformio()
 {
     pip install --user -U https://github.com/platformio/platformio/archive/develop.zip
@@ -239,22 +208,6 @@ function build_sketches_with_arduino()
     echo -e "travis_fold:end:size_report"
 }
 
-function check_examples_style()
-{
-    echo -e "travis_fold:start:check_examples_style"
-
-    find $TRAVIS_BUILD_DIR/libraries -name '*.ino' -exec \
-        astyle \
-            --suffix=none \
-            --options=$TRAVIS_BUILD_DIR/tests/examples_style.conf {} \;
-
-    # we have no control over submodules
-    git submodule foreach --recursive git reset --hard
-
-    git diff --exit-code -- $TRAVIS_BUILD_DIR/libraries
-
-    echo -e "travis_fold:end:check_examples_style"
-}
 
 set -e
 
@@ -293,25 +246,8 @@ elif [ "$BUILD_TYPE" = "platformio_odd" ]; then
     # PlatformIO
     install_platformio
     build_sketches_with_platformio $TRAVIS_BUILD_DIR/libraries "--board nodemcuv2 --verbose" 2 1
-elif [ "$BUILD_TYPE" = "docs" ]; then
-    # Build documentation using Sphinx
-    cd $TRAVIS_BUILD_DIR/doc
-    build_docs
-elif [ "$BUILD_TYPE" = "package" ]; then
-    # Check that boards.txt, ld scripts, package JSON template, and boards.rst are up to date
-    build_boards
-    # Build release package
-    cd $TRAVIS_BUILD_DIR/package
-    build_package
-elif [ "$BUILD_TYPE" = "host_tests" ]; then
-    # Run host side tests
-    cd $TRAVIS_BUILD_DIR/tests
-    run_host_tests
-elif [ "$BUILD_TYPE" = "style_check" ]; then
-    # Check code style
-    check_examples_style
 else
-    echo "BUILD_TYPE not set"
+    echo "BUILD_TYPE not set or invalid"
     exit 1
 fi