Upgrade to go 1.26

[irees]

Summary

Upgrades the Go toolchain from 1.24.2 to 1.26.0, bumps the CI PostGIS image from EOL PG 12 to PG 16 to match production, removes a stale Dockerfile, and carves out an explicit exception for the library's sqlite3://:memory: DSN which Go 1.26's stricter net/url.Parse now rejects.

Go toolchain bump

• go.mod directive bumped to go 1.26.0
• .github/workflows/test.yml, .github/workflows/check-go-generate.yaml, and all three build matrices in .github/workflows/release.yml (linux, macos-intel, macos-apple) set to go-version: '1.26.0'
• .claude/CLAUDE.md project-overview line updated to reflect Go 1.26

CI PostgreSQL image bump

• .github/workflows/test.yml test service image bumped from postgis/postgis:12-3.4-alpine to postgis/postgis:16-3.4-alpine. PostgreSQL 12 reached EOL in Nov 2024; PG 16 more closely matches production. The library uses no PG 13+ exclusive SQL (no MERGE, JSON_TABLE, ANY_VALUE, etc.), so the CI-only behavior change should be minimal. PostGIS pinned at 3.4 to keep scope tight.

Dockerfile cleanup

• Removed the top-level Dockerfile, which had been untouched since 2020 and was pinned to Ubuntu 18.04 (EOL) and golang-1.12 via a third-party PPA. It was not referenced anywhere in CI.

net/url regression in Go 1.26

Go 1.26 tightened net/url.Parse and now rejects sqlite3://:memory: because :memory: after // parses as host:port with a non-numeric port. This broke TestManager_* tests in internal/feedstate/ and any library consumer using the same in-memory DSN form.

Fix: keep url.Parse as the primary mechanism (preserving fragment handling, scheme case-normalization, and structural validation) and add an explicit string-equality carve-out for the one known incompatible form, shared as tldb.sqliteMemoryDBURL:

• tldb/adapter.go — newAdapter short-circuits the sqlite memory DSN and returns the registered sqlite3 adapter directly; all other dburls go through url.Parse unchanged
• tldb/common.go — getFvids returns an empty fvid list for the sqlite memory DSN and otherwise parses as before; errors from url.Parse continue to propagate

Existing tests in internal/feedstate/manager_test.go and tldb/sqlite/sqlite_test.go exercise this DSN end-to-end, so no new tests were added. The getFvids URL-smuggling behavior is preserved in case external consumers of transitland-lib rely on it.

Workflow hygiene

• .github/workflows/check-go-generate.yaml — bumped actions/github-script@v6 to @v7 for consistency with release.yml

Test plan

• Confirm go version reports 1.26.x locally before building
• go mod tidy produces no diff
• go vet ./... is clean
• (cd cmd/transitland && go build .) succeeds
• go test ./internal/feedstate/... ./tldb/... passes (previously failing on 1.26)
• Full test suite passes in CI against PG 16 / PostGIS 3.4
• Verify CI jobs run on 1.26.0: Test Suite, Check Generated Code, and on a tagged release the linux / macos-intel / macos-apple build jobs

[Copilot]

Pull request overview

Upgrades this repo’s Go toolchain and CI environment, and adjusts TLDB DSN parsing to avoid a Go 1.26 net/url.Parse behavior change that rejects sqlite3://:memory:.

Changes:

• Bump Go version references to 1.26.0 (go.mod + CI workflows + project docs).
• Update CI PostGIS service image from PG12 to PG16.
• Replace url.Parse usage in TLDB DSN handling with string-splitting to preserve support for sqlite3://:memory:; remove stale top-level Dockerfile.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tldb/common.go	Reworks getFvids to parse query params without url.Parse to avoid Go 1.26 DSN rejection.
tldb/adapter.go	Reworks adapter selection to derive scheme without url.Parse.
go.mod	Updates Go version directive to 1.26.0.
Dockerfile	Removes an obsolete, EOL-pinned Dockerfile.
.github/workflows/test.yml	Updates Go version and PostGIS service image for CI.
.github/workflows/release.yml	Updates Go version in release build matrices.
.github/workflows/check-go-generate.yaml	Updates Go version for codegen checks.
.claude/CLAUDE.md	Updates documented Go version reference.

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