Use go-git library instead of git binary in bumper

cmd/image-autobumper/Dockerfile

@@ -22,6 +22,6 @@ LABEL io.kyma-project.source=github.com/kyma-project/test-infra/cmd/image-autobu
 # Copy the built Go app from the builder stage
 COPY --from=builder /app/cmd/image-autobumper/main /image-autobumper
 
-RUN apk add --no-cache ca-certificates git && \
+RUN apk add --no-cache ca-certificates && \
     chmod +x /image-autobumper
 ENTRYPOINT ["/image-autobumper"]

go.mod

@@ -17,6 +17,7 @@ require (
 	github.com/coreos/go-oidc/v3 v3.11.0
 	github.com/forestgiant/sliceutil v0.0.0-20160425183142-94783f95db6c
 	github.com/fsnotify/fsnotify v1.7.0
+	github.com/go-git/go-git/v5 v5.6.1
 	github.com/go-jose/go-jose/v4 v4.0.4
 	github.com/go-playground/validator/v10 v10.22.1
 	github.com/google/go-containerregistry v0.20.2
@@ -66,6 +67,9 @@ require (
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.48.1 // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.48.1 // indirect
 	github.com/GoogleCloudPlatform/testgrid v0.0.123 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 // indirect
+	github.com/acomagu/bufpipe v1.0.4 // indirect
 	github.com/andygrunwald/go-jira v1.14.0 // indirect
 	github.com/aws/aws-sdk-go v1.38.49 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
@@ -76,6 +80,7 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/charmbracelet/lipgloss v0.5.0 // indirect
 	github.com/clarketm/json v1.13.4 // indirect
+	github.com/cloudflare/circl v1.1.0 // indirect
 	github.com/cncf/xds/go v0.0.0-20240905190251-b4127c9b8d78 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.14.3 // indirect
 	github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 // indirect
@@ -86,6 +91,7 @@ require (
 	github.com/docker/distribution v2.8.2+incompatible // indirect
 	github.com/docker/docker-credential-helpers v0.7.0 // indirect
 	github.com/emicklei/go-restful/v3 v3.10.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/envoyproxy/go-control-plane v0.13.0 // indirect
 	github.com/envoyproxy/protoc-gen-validate v1.1.0 // indirect
 	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
@@ -97,6 +103,8 @@ require (
 	github.com/fvbommel/sortorder v1.0.1 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/gitleaks/go-gitdiff v0.9.1 // indirect
+	github.com/go-git/gcfg v1.5.0 // indirect
+	github.com/go-git/go-billy/v5 v5.4.1 // indirect
 	github.com/go-kit/log v0.2.1 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
@@ -134,9 +142,11 @@ require (
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/compress v1.17.2 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
@@ -158,6 +168,7 @@ require (
 	github.com/opencontainers/image-spec v1.1.0-rc3 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
+	github.com/pjbgf/sha1cd v0.3.0 // indirect
 	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_golang v1.15.1 // indirect
@@ -169,8 +180,10 @@ require (
 	github.com/rs/zerolog v1.29.0 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
 	github.com/shurcooL/githubv4 v0.0.0-20211117020012-5800b9de5b8b // indirect
 	github.com/shurcooL/graphql v0.0.0-20181231061246-d48a9a75455f // indirect
+	github.com/skeema/knownhosts v1.1.0 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
@@ -181,6 +194,7 @@ require (
 	github.com/tidwall/pretty v1.2.0 // indirect
 	github.com/trivago/tgo v1.0.7 // indirect
 	github.com/vbatts/tar-split v0.11.3 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	go.opencensus.io v0.24.0 // indirect
 	go.opentelemetry.io/contrib/detectors/gcp v1.29.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.54.0 // indirect
@@ -195,6 +209,7 @@ require (
 	go4.org v0.0.0-20201209231011-d4a079459e60 // indirect
 	gocloud.dev v0.19.0 // indirect
 	golang.org/x/crypto v0.28.0 // indirect
+	golang.org/x/mod v0.21.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
 	golang.org/x/sys v0.26.0 // indirect
 	golang.org/x/term v0.25.0 // indirect
@@ -213,6 +228,7 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	k8s.io/component-base v0.27.2 // indirect
 	k8s.io/klog/v2 v2.90.1 // indirect