feat(upstream): git_tags adapter via go-git ls-remote

The general-case "any Git remote" adapter. source_ref is a clone URL —
HTTPS or git:// — anything go-git can resolve. Fetch performs the
equivalent of `git ls-remote --tags <url>` against the remote, filters
to tag refs (skipping the "^{}" peel suffix for annotated tags), and
picks the highest by CompareVersions (which is why the rc10/rc2 fix
matters: this adapter actually relies on numeric-aware suffix sort).

Uses go-git's in-memory storage so nothing hits disk and there's no
runtime dependency on the git binary in the server image. ListContext
respects the syncer's per-row 20-second timeout via the passed ctx.

Anonymous-only. Private repos belong on the dedicated github / gitea /
gitlab / bitbucket adapters which honor their token env vars; the
git_tags adapter is for the long tail (kernel.org, savannah, any
non-platform Git remote).

Dep additions: github.com/go-git/go-git/v5 plus its tree. The go.mod
hygiene upgrades to golang.org/x/* came along with `go get`; no API
changes affect existing code.

PublishedAt is left nil — ls-remote returns refs and SHAs, not tag
dates, and a follow-up fetch-by-tag would defeat the "no disk, no
clone" design. Operators who want the date should track via the
hosted-platform adapters.

server/go.mod

@@ -1,6 +1,6 @@
 module github.com/Fimeg/RedFlag/server
 
-go 1.24.0
+go 1.25.0
 
 require (
 	github.com/alexedwards/argon2id v1.0.0
@@ -14,18 +14,26 @@ require (
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
 	github.com/bytedance/sonic v1.14.0 // indirect
 	github.com/bytedance/sonic/loader v0.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cloudflare/circl v1.6.3 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/containerd/log v0.1.0 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
 	github.com/distribution/reference v0.6.0 // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.9.0 // indirect
+	github.com/go-git/go-git/v5 v5.19.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
@@ -34,7 +42,10 @@ require (
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
@@ -45,11 +56,15 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/pjbgf/sha1cd v0.6.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/quic-go/quic-go v0.54.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.3.0 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0 // indirect
 	go.opentelemetry.io/otel v1.39.0 // indirect
@@ -58,14 +73,15 @@ require (
 	go.opentelemetry.io/otel/trace v1.39.0 // indirect
 	go.uber.org/mock v0.5.0 // indirect
 	golang.org/x/arch v0.20.0 // indirect
-	golang.org/x/crypto v0.44.0 // indirect
-	golang.org/x/mod v0.29.0 // indirect
-	golang.org/x/net v0.47.0 // indirect
-	golang.org/x/sync v0.18.0 // indirect
-	golang.org/x/sys v0.39.0 // indirect
-	golang.org/x/text v0.31.0 // indirect
+	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/mod v0.34.0 // indirect
+	golang.org/x/net v0.53.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/text v0.36.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	golang.org/x/tools v0.38.0 // indirect
+	golang.org/x/tools v0.43.0 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gotest.tools/v3 v3.5.2 // indirect
 )