Add inputs 'update-toolchains-only', 'update-env-javahome', 'add-to-env-path'

Changes in detail:
------------------
- action.yml:
  - add inputs:
    - update-toolchains-only
    - update-env-javahome
    - add-to-env-path
  - update description for input "overwrite-settings"
  - remove default value of input "overwrite-settings",
    since the default is now propagated from input 'update-toolchains-only'

- base-models.ts:
  - extend interface JavaInstallerOptions:
    - add fields:
      - updateEnvJavaHome: boolean;
      - addToEnvPath: boolean;

- constants.ts:
  - add constant INPUT_UPDATE_TOOLCHAINS_ONLY
    = 'update-toolchains-only'

- auth.ts:
  - function configureAuthentication():
    - add parameter:
      - overwriteSettings: boolean
    - remove the now obsolete const overwriteSettings

- toolchains.ts:
  - function configureToolchains(...):
    - add parameter updateToolchains: boolean
    - remove the now obsolete const overwriteSettings
  - improve variable naming:
    - rename any occurrence of 'overwriteSettings'
        by 'updateToolchains'
    - add field updateToolchains: boolean to the parameter object
  - function writeToolchainsFileToDisk(...):
    - improve variable naming:
      - rename variable 'settingsExists'
          by 'toolchainsExists'
    - update wording of info logs to be more applicable

- setup-java.ts:
  - interface installerInputsOptions:
    - rename to IInstallerInputsOption to meet common coding convention
    - add fields:
      - updateToolchainsOnly: boolean;
      - overwriteSettings: boolean;
      - updateEnvJavaHome: boolean;
      - addToEnvPath: boolean;
  - function run():
    - add const:
      - const updateToolchainsOnly:
        - get as boolean from input 'update-toolchains-only', default: false
      - const overwriteSettings:
        - get as boolean from input 'overwrite-settings', default: !updateToolchainsOnly
      - const updateEnvJavaHome:
        - get as boolean input 'update-env-javahome', default: !updateToolchainsOnly
      - const addToEnvPath:
        - get as boolean input 'add-to-env-path', default: !updateToolchainsOnly
   - extend const installerInputsOptions to match with IInstallerInputsOption:
      - add field updateToolchainsOnly
      - add field overwriteSettings
      - add field updateEnvJavaHome
      - add field addToEnvPath
    - update call of auth.configureAuthentication()
        to auth.configureAuthentication(overwriteSettings)
  - function installVersion(...):
    - add const and init from parameter options:
      - updateToolchainsOnly, overwriteSettings,
        updateEnvJavaHome, addToEnvPath
    - init the additional fields of installerInputsOptions accordingly
    - call toolchains.configureToolchains(...):
      - with parameter updateToolchains= overwriteSettings || updateToolchainsOnly

- base-installer.ts:
  - add constants to import from constants:
    - INPUT_UPDATE_JAVA_HOME
    - INPUT_ADD_TO_PATH
  - add fields:
    - protected updateEnvJavaHome: boolean;
    - protected addToEnvPath: boolean;
  - ctor:
    - init these fields from JavaInstallerOptions accoprdingly
  - function setJavaDefault(...):
    - if updateEnvJavaHome is false:
      - SKIP updating env.JAVA_HOME
      - log info:
        `Skip updating env.JAVA_HOME according to ${INPUT_UPDATE_JAVA_HOME}`
    - if addToEnvPath is false:
      - SKIP adding toolchain path to env.PATH
      - log info:
        `Skip adding to env.PATH according to ${INPUT_ADD_TO_PATH}`

src/toolchains.ts

@@ -19,6 +19,7 @@ export async function configureToolchains(
   version: string,
   distributionName: string,
   jdkHome: string,
+  updateToolchains: boolean,
   toolchainId?: string
 ) {
   const vendor =
@@ -27,10 +28,6 @@ export async function configureToolchains(
   const settingsDirectory =
     core.getInput(constants.INPUT_SETTINGS_PATH) ||
     path.join(os.homedir(), constants.M2_DIR);
-  const overwriteSettings = getBooleanInput(
-    constants.INPUT_OVERWRITE_SETTINGS,
-    true
-  );
 
   await createToolchainsSettings({
     jdkInfo: {
@@ -40,21 +37,21 @@ export async function configureToolchains(
       jdkHome
     },
     settingsDirectory,
-    overwriteSettings
+    updateToolchains
   });
 }
 
 export async function createToolchainsSettings({
   jdkInfo,
   settingsDirectory,
-  overwriteSettings
+  updateToolchains
 }: {
   jdkInfo: JdkInfo;
   settingsDirectory: string;
-  overwriteSettings: boolean;
+  updateToolchains: boolean;
 }) {
   core.info(
-    `Creating ${constants.MVN_TOOLCHAINS_FILE} for JDK version ${jdkInfo.version} from ${jdkInfo.vendor}`
+    `Adding a toolchain entry in ${constants.MVN_TOOLCHAINS_FILE} for JDK version ${jdkInfo.version} from ${jdkInfo.vendor}`
   );
   // when an alternate m2 location is specified use only that location (no .m2 directory)
   // otherwise use the home/.m2/ path
@@ -72,7 +69,7 @@ export async function createToolchainsSettings({
   await writeToolchainsFileToDisk(
     settingsDirectory,
     updatedToolchains,
-    overwriteSettings
+    updateToolchains
   );
 }
 
@@ -147,17 +144,17 @@ async function readExistingToolchainsFile(directory: string) {
 async function writeToolchainsFileToDisk(
   directory: string,
   settings: string,
-  overwriteSettings: boolean
+  updateToolchains: boolean
 ) {
   const location = path.join(directory, constants.MVN_TOOLCHAINS_FILE);
-  const settingsExists = fs.existsSync(location);
-  if (settingsExists && overwriteSettings) {
-    core.info(`Overwriting existing file ${location}`);
-  } else if (!settingsExists) {
-    core.info(`Writing to ${location}`);
+  const toolchainsExists = fs.existsSync(location);
+  if (toolchainsExists && updateToolchains) {
+    core.info(`Updating existing file ${location}`);
+  } else if (!toolchainsExists) {
+    core.info(`Creating file ${location}`);
   } else {
     core.info(
-      `Skipping generation of ${location} because file already exists and overwriting is not enabled`
+      `Skipping update of ${location} since file already exists and updating is not enabled`
     );
     return;
   }