feat(cicd): add an executable jar

- Generate a self executable jar
- Refactor the docker image to use the executable
- Add a command `plugins install` to download a plugins

gradle/jar/selfrun.bat

@@ -0,0 +1,42 @@
+@echo off
+
+REM NOTE: Do not use backquotes in this bat file because backquotes are unintentionally recognized by sh.
+REM NOTE: Just quotes are available for [ for /f "delims=" %%w ('...') ].
+
+setlocal
+
+REM Do not use %0 to identify the JAR (bat) file.
+REM %0 is just "kestra" when run by just "> kestra" while %0 is "kestra.bat" when run by "> kestra.bat".
+SET this=%~f0
+
+REM Plugins path default to pwd & must be exported as env var
+SET "current_dir=%~dp0"
+IF NOT DEFINED kestra_plugins_path (set "kestra_plugins_path=%current_dir%plugins\")
+
+
+REM Check java version
+FOR /f "delims=" %%w in ('java -fullversion 2^>^&1') do set java_fullversion=%%w
+
+ECHO %java_fullversion% | find " full version ""1." > NUL
+IF NOT ERRORLEVEL 1 (set java_version=1)
+
+ECHO %java_fullversion% | find " full version ""9" > NUL
+IF NOT ERRORLEVEL 1 (set java_version=9)
+
+ECHO %java_fullversion% | find " full version ""10" > NUL
+IF NOT ERRORLEVEL 1 (set java_version=10)
+
+IF NOT DEFINED java_version (set java_version=0)
+
+IF %java_version% NEQ 0 (
+    ECHO [ERROR] Kestra require at least Java 11.. 1>&2
+    EXIT 1
+)
+
+echo java %JAVA_OPTS% -cp "%this%:%kestra_plugins_path%*" org.kestra.cli.App %*
+
+java %JAVA_OPTS% -cp "%this%;%kestra_plugins_path%*" org.kestra.cli.App %*
+
+ENDLOCAL
+
+exit /b %ERRORLEVEL%

gradle/jar/selfrun.sh

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+# Plugins path default to pwd & must be exported as env var
+KESTRA_PLUGINS_PATH=${KESTRA_PLUGINS_PATH:-"$(dirname "$0")/plugins"}
+export KESTRA_PLUGINS_PATH=${KESTRA_PLUGINS_PATH}
+
+# Check java version
+JAVA_FULLVERSION=$(java -fullversion 2>&1)
+case "$JAVA_FULLVERSION" in
+    [a-z]*\ full\ version\ \"\(1|9|10\)\..*\")
+        echo "[ERROR] Kestra require at least Java 11." 1>&2
+        exit 1
+        ;;
+esac
+
+# Exec
+exec java ${JAVA_OPTS} -cp "$0:${KESTRA_PLUGINS_PATH}/*" org.kestra.cli.App "$@"
+exit 127