Rework CI workflows (#8688)

- split workflows into separate files to trigger by path
  this should help out documentation and boards / eboot / pkg files
  updates, since those *wont* trigger usual build stuff anymore
- build*.sh whatever merged into just common.sh and build.sh
  trigger different parity builds, mod % rem and allow to set .ino list
  through the environment variable
- removes unnecessary temporary files, try to use more pipes
  move remaining ones into cache dir instead of PWD
- remove legacy TRAVIS env vars, use ESP8266_ARDUINO prefix for config
- remove Windows path workarounds
- hardware/ and ide/ directories are set through envionment
  do not force specific paths, simplify builds on local machine
- sketch list is set through environment. expicit paths for Windows and
  macOS builders. platformio also gets a real shuffled list instead of
  mod and rem magic numbers
- detect root of the repo through git cli, not base{name,dir} or relative paths

tests/build.sh

@@ -1,21 +1,85 @@
 #!/usr/bin/env bash
 
-cache_dir=$(mktemp -d)
+root=$(git rev-parse --show-toplevel)
 
-source "$TRAVIS_BUILD_DIR"/tests/common.sh
+ESP8266_ARDUINO_BUILD_DIR=${ESP8266_ARDUINO_BUILD_DIR:-$root}
+ESP8266_ARDUINO_BUILDER=${ESP8266_ARDUINO_BUILDER:-arduino}
+ESP8266_ARDUINO_PRESERVE_CACHE=${ESP8266_ARDUINO_PRESERVE_CACHE:-}
 
-if [ -z "$BUILD_PARITY" ]; then
-    mod=1
-    rem=0
-elif [ "$BUILD_PARITY" = "even" ]; then
-    mod=2
-    rem=0
-elif [ "$BUILD_PARITY" = "odd" ]; then
-    mod=2
-    rem=1
+ESP8266_ARDUINO_IDE=${ESP8266_ARDUINO_IDE:-$HOME/arduino_ide}
+ESP8266_ARDUINO_HARDWARE=${ESP8266_ARDUINO_HARDWARE:-$HOME/Arduino/hardware}
+ESP8266_ARDUINO_LIBRARIES=${ESP8266_ARDUINO_LIBRARIES:-$HOME/Arduino/libraries}
+
+ESP8266_ARDUINO_DEBUG=${ESP8266_ARDUINO_DEBUG:-nodebug}
+ESP8266_ARDUINO_LWIP=${ESP8266_ARDUINO_LWIP:-default}
+ESP8266_ARDUINO_SKETCHES=${ESP8266_ARDUINO_SKETCHES:-}
+
+source "$root/tests/common.sh"
+
+cmd=${0##*/}
+usage="
+ENVIRONMENT:
+  ESP8266_ARDUINO_SKETCHES - list of .ino files; defaults to **all available examples**
+  ESP8266_ARDUINO_BUILDER - arduino or platformio
+
+  For Arduino IDE:
+    ESP8266_ARDUINO_IDE - path to the IDE (portable)
+    ESP8266_ARDUINO_HARDWARE - path to the hardware directory (usually, containing our repo)
+    ESP8266_ARDUINO_LIBRATIES - path to the libraries directory (external dependencies)
+    ESP8266_ARDUINO_DEBUG - debug or nodebug
+    ESP8266_ARDUINO_LWIP - v4 or v6
+
+USAGE:
+  $cmd <[even | odd]> - build every Nth, when '<N> % 2' is either even or odd
+  $cmd <mod> <rem> - build every Nth, when '<N> % <mod>' is equal to 'rem'
+  $cmd - build every .ino file from ESP8266_ARDUINO_SKETCHES
+"
+
+mod=1
+rem=0
+
+if [ "$#" -eq 1 ] ; then
+    case "$1" in
+    "-h")
+        echo "$usage"
+        exit 0
+        ;;
+    "even")
+        mod=2
+        rem=0
+        ;;
+    "odd")
+        mod=2
+        rem=1
+        ;;
+    *)
+        echo 'Can either be even or odd'
+        exit 1
+        ;;
+    esac
+elif [ "$#" -eq 2 ] ; then
+    mod=$1
+    rem=$2
+elif [ "$#" -gt 2 ] ; then
+    echo "$usage"
+    exit 1
 fi
 
-install_arduino nodebug
-build_sketches_with_arduino "$mod" "$rem" lm2f
+if [ -z "$ESP8266_ARDUINO_SKETCHES" ] ; then
+    ESP8266_ARDUINO_SKETCHES=$(find $root/libraries -name *.ino | sort)
+fi
 
-rm -rf "$cache_dir"
+case "$ESP8266_ARDUINO_BUILDER" in
+"arduino")
+    install_arduino "$ESP8266_ARDUINO_DEBUG"
+    build_sketches_with_arduino "$mod" "$rem" "$ESP8266_ARDUINO_LWIP"
+    ;;
+"platformio")
+    install_platformio nodemcuv2
+    build_sketches_with_platformio "$mod" "$rem"
+    ;;
+*)
+    echo "Unknown builder! Must be either arduino or platformio"
+    exit 1
+    ;;
+esac