ci(pages): optimize vault dependency download in build workflow

Replace GOPRIVATE with GOSUMDB=off and download only the specific gitcaddy-vault module instead of all dependencies. This speeds up the build process and avoids unnecessary downloads.

.gitea/workflows/build.yml

@@ -347,8 +347,8 @@ jobs:
       - name: Update vault dependency (Unix)
         if: matrix.goos != 'windows'
         env:
-          GOPRIVATE: ""
           GOPROXY: direct
+          GOSUMDB: off
         run: |
           set -x
           VAULT_VERSION="${{ steps.vault.outputs.version }}"
@@ -360,14 +360,14 @@ jobs:
             sed -i "s|replace git.marketally.com/gitcaddy/gitcaddy-vault => ../gitcaddy-vault|replace git.marketally.com/gitcaddy/gitcaddy-vault => git.marketally.com/gitcaddy/gitcaddy-vault $VAULT_VERSION|" go.mod
           fi
           cat go.mod | grep -A2 "gitcaddy-vault" || true
-          go mod download
+          go mod download git.marketally.com/gitcaddy/gitcaddy-vault
 
       - name: Update vault dependency (Windows)
         if: matrix.goos == 'windows'
         shell: pwsh
         env:
-          GOPRIVATE: ""
           GOPROXY: direct
+          GOSUMDB: off
         run: |
           $vaultVersion = "${{ steps.vault-win.outputs.version }}"
           Write-Host "Building with vault $vaultVersion"
@@ -375,7 +375,7 @@ jobs:
           $content = $content -replace 'replace git.marketally.com/gitcaddy/gitcaddy-vault => ../gitcaddy-vault', "replace git.marketally.com/gitcaddy/gitcaddy-vault => git.marketally.com/gitcaddy/gitcaddy-vault $vaultVersion"
           Set-Content go.mod $content -NoNewline
           Get-Content go.mod | Select-String "gitcaddy/vault" -Context 0,2
-          go mod download
+          go mod download git.marketally.com/gitcaddy/gitcaddy-vault
 
       - name: Setup Node.js
         uses: actions/setup-node@v4