could you add instructions for local builds?

[reynoldsm88]

hello, i would like to help contribute to this project, however, i cannot get the project to build from a clean git checkout. it seems like maven is expecting some environmental properties to be set. would you mind adding some documentation just to help developers get a local build/unit test setup working?

here are the errors i am getting from maven:

[ERROR] Child module /Users/michael/oss/arangodb-spark-datasource/arangodb-spark-datasource-${spark.compat.version} of /Users/michael/oss/arangodb-spark-datasource/pom.xml does not exist @
[ERROR] 'dependencies.dependency.artifactId' for com.arangodb:jackson-dataformat-velocypack${jackson.vpack.variant}:jar with value 'jackson-dataformat-velocypack${jackson.vpack.variant}' does not match a valid id pattern. @ line 165, column 25
[ERROR] 'dependencies.dependency.version' for com.arangodb:jackson-dataformat-velocypack${jackson.vpack.variant}:jar must be a valid version but is '${jackson.vpack.version}'. @ line 166, column 22
[ERROR] 'dependencies.dependency.version' for org.scala-lang:scala-library:jar must be a valid version but is '${scala.version}'. @ line 185, column 22
[ERROR] 'dependencies.dependency.artifactId' for org.apache.spark:spark-core_${scala.compat.version}:jar with value 'spark-core_${scala.compat.version}' does not match a valid id pattern. @ line 190, column 25
[ERROR] 'dependencies.dependency.version' for org.apache.spark:spark-core_${scala.compat.version}:jar must be a valid version but is '${spark.version}'. @ line 191, column 22
[ERROR] 'dependencies.dependency.artifactId' for org.apache.spark:spark-sql_${scala.compat.version}:jar with value 'spark-sql_${scala.compat.version}' does not match a valid id pattern. @ line 196, column 25
[ERROR] 'dependencies.dependency.version' for org.apache.spark:spark-sql_${scala.compat.version}:jar must be a valid version but is '${spark.version}'. @ line 197, column 22
[ERROR] 'dependencies.dependency.artifactId' for com.sksamuel.scapegoat:scalac-scapegoat-plugin_${scala.version}:jar with value 'scalac-scapegoat-plugin_${scala.version}' does not match a valid id pattern. @ line 202, column 25```

[rashtao]

Here can see how to build, start the test environment and test: https://github.com/arangodb/arangodb-spark-datasource/blob/main/.github/workflows/test.yml#L16-L84

For more clarity I will also update https://github.com/arangodb/arangodb-spark-datasource/blob/main/dev-README.md accordingly.

[reynoldsm88]

@rashtao thank you very much! sorry i didn't see all the other README files. once i get my local build running i will close this issue.

[rashtao]

Closing for now, feel free to reopen in case of further problems.