cicd jdk versions and gitignore. (#11)

- Note JDK LTS versions and removed unsupported version in github cicd workflow. 
- Added vscode calva related dirs to gitignore.

.github/workflows/clojure.yml

@@ -13,7 +13,8 @@ jobs:
 
     strategy:
       matrix:
-        jdk_version: [8, 11, 14, 15, 16]
+        # JDK LTS: 8, 11, 17
+        jdk_version: [8, 11, 15, 16]
         os: [ubuntu-latest]
 
     container:

.gitignore

@@ -1,13 +1,15 @@
-/target
-/classes
+/.calva
 /checkouts
-profiles.clj
-pom.xml
-pom.xml.asc
-*.jar
 *.class
-/.calva
+/classes
+.clj-kondo/
+.hg/
+.hgignore
+*.jar
 /.lein-*
+.lsp/
 /.nrepl-port
-.hgignore
-.hg/
+pom.xml
+pom.xml.asc
+profiles.clj
+/target