First pass implementation of an SQLite backing store for fetched opportunities

internal/config/README.md

@@ -34,6 +34,7 @@ is kept.
 |---|---|---|---|
 | `logging.level` | string | `warn` | One of `debug`, `info`, `warn`, `error` |
 | `logging.file` | string | | Log file for `fetch service` (unless `--foreground`); other commands log to the terminal |
+| `database.file` | string | | Path to the SQLite database file, used by the `migrate` commands |
 | `sources.<source>.enabled` | bool | `false` | For every source |
 | `sources.<source>.interval` | duration | `10m` | For every source; e.g. `30s`, `1h` |
 | `sources.find_a_tender.api_root` | string | `https://www.find-tender.service.gov.uk/api/1.0` | URL of the Find a Tender API |
@@ -49,6 +50,8 @@ Example `config.yaml`:
 logging:
     level: info
     file: ""
+database:
+    file: ./jobsearch.db
 sources:
     find_a_tender:
         enabled: true
@@ -126,6 +129,7 @@ Nothing in `section.go` needs changing.
 | File | Contents |
 |---|---|
 | `config.go` | `JobSearchConfig`, defaults, Viper loading, text output |
+| `conf_database.go` | `database` section |
 | `load.go` | `Init`, `.env` and config file loading |
 | `modify.go` | `StoreValue` and `PurgeValue` |
 | `section.go` | The `Section` interface and the struct tag reflection shared by every section |