ci: add security pipeline and harden prod build

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+  # Go module dependencies. Keeps cobra/pflag and their transitive deps
+  # patched; pairs with the govulncheck gate in ci.yml.
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5
+
+  # GitHub Actions versions. When the actions are later SHA-pinned, this
+  # is what bumps the pinned SHAs (and annotates them with the version).
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   # Cross-platform verification. The project cross-compiles cleanly to
   # all three OSes via the release workflow, but "compiles" ≠ "runtime-
@@ -27,7 +30,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version-file: go.mod
 
       - name: Vet
         run: go vet ./...
@@ -50,7 +53,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version-file: go.mod
 
       - name: Build
         run: make build
@@ -61,3 +64,22 @@ jobs:
       - name: Quality gates
         run: ./gitcortex ci --fail-on-churn-risk 5500 --format github-actions
         # Add --fail-on-busfactor 1 when team grows
+
+  # Vulnerability scan against the Go vulnerability database. govulncheck
+  # does reachability analysis, so it only fails when vulnerable code is
+  # actually reachable from this module — low false-positive, safe as a
+  # blocking gate. Covers both our deps and the stdlib we call.
+  vulncheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Install govulncheck
+        run: go install golang.org/x/vuln/cmd/govulncheck@latest
+
+      - name: Run govulncheck
+        run: govulncheck ./...

.github/workflows/pages.yml

@@ -25,7 +25,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version-file: go.mod
 
       - name: Build gitcortex
         run: make build

.github/workflows/release.yml

@@ -18,22 +18,37 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version-file: go.mod
+
+      - name: Vet
+        run: go vet ./...
 
       - name: Test
         run: go test ./... -count=1
 
+      # CGO_ENABLED=0 -> fully static binaries (no libc dependency, run on
+      # any Linux). -s -w strips the symbol table and DWARF: ~25-30%
+      # smaller artifacts. Go panic stack traces survive (they use the
+      # embedded pclntab, not ELF/DWARF) — only interactive debuggers
+      # (delve/gdb) lose symbols, which we never run against a release.
       - name: Build binaries
+        env:
+          CGO_ENABLED: 0
         run: |
           VERSION=${GITHUB_REF#refs/tags/}
-          LDFLAGS="-X main.version=$VERSION"
+          LDFLAGS="-s -w -X main.version=$VERSION"
 
           GOOS=linux   GOARCH=amd64 go build -trimpath -ldflags "$LDFLAGS" -o dist/gitcortex-linux-amd64       ./cmd/gitcortex/
           GOOS=linux   GOARCH=arm64 go build -trimpath -ldflags "$LDFLAGS" -o dist/gitcortex-linux-arm64       ./cmd/gitcortex/
           GOOS=darwin  GOARCH=amd64 go build -trimpath -ldflags "$LDFLAGS" -o dist/gitcortex-darwin-amd64      ./cmd/gitcortex/
           GOOS=darwin  GOARCH=arm64 go build -trimpath -ldflags "$LDFLAGS" -o dist/gitcortex-darwin-arm64      ./cmd/gitcortex/
           GOOS=windows GOARCH=amd64 go build -trimpath -ldflags "$LDFLAGS" -o dist/gitcortex-windows-amd64.exe ./cmd/gitcortex/
 
+      # Publish checksums so downloads can be verified:
+      #   sha256sum -c SHA256SUMS
+      - name: Checksums
+        run: cd dist && sha256sum gitcortex-* > SHA256SUMS
+
       - name: Create release
         uses: softprops/action-gh-release@v2
         with: