Support changing SchemaSpy version

[borcsokj]

Changes

• Exclude SchemaSpy artifact (JAR file) from repository, download it on the fly,
• Support changing SchemaSpy version using environment variable (no need to wire it into GitHub action sources but default value only),
• Increased PostgreSQL JDBC version (sync to latest official SchemaSpy version),
• No need to publish SchemaSpy Docker image manually (i.e. to GitHub Container Registry), it is created by the workflow.

Example

The following example demonstrates how SchemaSpy version is overriden (so generated Types tab for enumerations of PostgreSQL database: https://github.com/borcsokj/schemaspy/tree/TypesTab):

      - name: Run SchemaSpy
        uses: 'tj-actions/schemaspy@v2' # tested as borcsokj/run-schemaspy@v2
        with:
          host: postgres
          port: 5432
          database_name: sandbox
          database_type: pgsql
          user: postgres
          password: *****
          all: true
        env:
          SCHEMASPY_GROUP_ID: io.github.borcsokj
          SCHEMASPY_ARTIFACT_ID: schemaspy
          SCHEMASPY_VERSION: 7.0.0-pre1