Added gigs_total_disk_space to host_disks. (#15753)

Added gigs_total_disk_space to host_disks.

This is just the migration that is needed for the rest of the changes in
#15058

server/datastore/mysql/migrations/tables/20231219143041_AddGigsTotalToHostDisks.go

@@ -0,0 +1,26 @@
+package tables
+
+import (
+	"database/sql"
+	"fmt"
+)
+
+func init() {
+	MigrationClient.AddMigration(Up_20231219143041, Down_20231219143041)
+}
+
+func Up_20231219143041(tx *sql.Tx) error {
+	stmt := `
+		ALTER TABLE host_disks
+		ADD COLUMN gigs_total_disk_space decimal(10,2) NOT NULL DEFAULT '0.00';
+	`
+	if _, err := tx.Exec(stmt); err != nil {
+		return fmt.Errorf("add gigs_total_disk_space to host_disks: %w", err)
+	}
+
+	return nil
+}
+
+func Down_20231219143041(tx *sql.Tx) error {
+	return nil
+}

server/datastore/mysql/migrations/tables/20231219143041_AddGigsTotalToHostDisks_test.go

@@ -0,0 +1,35 @@
+package tables
+
+import (
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"testing"
+)
+
+func TestUp_20231219143041(t *testing.T) {
+	db := applyUpToPrev(t)
+
+	insertStmt := `INSERT INTO host_disks (host_id) VALUES (1)`
+	_, err := db.Exec(insertStmt)
+	require.NoError(t, err)
+
+	// Apply current migration.
+	applyNext(t, db)
+
+	type diskSpace struct {
+		HostID             uint    `db:"host_id"`
+		GigsTotalDiskSpace float64 `db:"gigs_total_disk_space"`
+	}
+
+	var ds diskSpace
+	err = db.Get(&ds, `SELECT host_id, gigs_total_disk_space from host_disks where host_id = 1`)
+	require.NoError(t, err)
+	assert.Equal(t, float64(0), ds.GigsTotalDiskSpace)
+
+	_, err = db.Exec(`INSERT INTO host_disks (host_id, gigs_total_disk_space) VALUES (2, 1.5)`)
+	require.NoError(t, err)
+	err = db.Get(&ds, `SELECT host_id, gigs_total_disk_space from host_disks where host_id = 2`)
+	require.NoError(t, err)
+	assert.Equal(t, 1.5, ds.GigsTotalDiskSpace)
+
+}