refactor: replace go-git with the git CLI for gitignore filtering (#1309)

Replace go-git in `exec --use-gitignore` filtering with `git ls-files`. The git CLI is already required for action clones since https://gitea.com/gitea/runner/pulls/1277, so this drops `go-git` and 14 other modules, and filtering now follows git's own ignore rules.

Also stop deleting a remote action's `.gitignore` before copying it. Tracked files are never filtered, so the deletion only made copied actions differ from GitHub's action tarballs.

Reviewed-on: https://gitea.com/gitea/runner/pulls/1309
Reviewed-by: bircni <[email protected]>
Co-authored-by: silverwind <[email protected]>

go.mod

@@ -17,8 +17,6 @@ require (
 	github.com/docker/cli v29.8.2+incompatible
 	github.com/docker/go-connections v0.8.1
 	github.com/docker/go-units v0.5.0
-	github.com/go-git/go-billy/v5 v5.9.2
-	github.com/go-git/go-git/v5 v5.19.3
 	github.com/google/go-cmp v0.7.0
 	github.com/johannesboyne/gofakes3 v1.2.0
 	github.com/joho/godotenv v1.5.1
@@ -58,26 +56,19 @@ require (
 require (
 	cyphar.com/go-pathrs v0.2.5 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
-	github.com/ProtonMail/go-crypto v1.4.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cloudflare/circl v1.6.5 // indirect
 	github.com/containerd/errdefs/pkg v0.3.0 // indirect
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/cyphar/filepath-securejoin v0.7.0 // indirect
 	github.com/docker/docker-credential-helpers v0.9.8 // indirect
-	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/felixge/httpsnoop v1.1.0 // indirect
-	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
 	github.com/go-logr/logr v1.4.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
-	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
-	github.com/kevinburke/ssh_config v1.6.0 // indirect
 	github.com/klauspost/compress v1.19.2 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
 	github.com/moby/sys/sequential v0.7.0 // indirect
@@ -85,22 +76,16 @@ require (
 	github.com/moby/sys/userns v0.2.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/pjbgf/sha1cd v0.7.0 // indirect
 	github.com/prometheus/common v0.70.1 // indirect
 	github.com/prometheus/procfs v0.21.1 // indirect
 	github.com/ryszard/goskiplist v0.0.0-20150312221310-2dfbae5fcf46 // indirect
 	github.com/santhosh-tekuri/jsonschema/v6 v6.0.3 // indirect
-	github.com/sergi/go-diff v1.4.0 // indirect
-	github.com/skeema/knownhosts v1.3.2 // indirect
 	github.com/stretchr/objx v0.5.3 // 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 v0.70.0 // indirect
 	go.opentelemetry.io/otel/log v1.47.0 // indirect
 	go.opentelemetry.io/otel/metric v1.47.0 // indirect
 	go.shabbyrobe.org/gocovmerge v0.0.0-20230507111327-fa4f82cfbf4d // indirect
 	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	golang.org/x/crypto v0.57.0 // indirect
 	golang.org/x/tools v0.49.0 // indirect
-	gopkg.in/warnings.v0 v0.1.2 // indirect
 )