fix: avoid actions checkout and clone repo directly

.gitea/workflows/iperf3.yml

@@ -19,12 +19,19 @@ jobs:
     runs-on: alpine-latest
 
     steps:
-      - name: Checkout
+      - name: Bootstrap workspace
-        uses: actions/checkout@v4
+        shell: sh
+        run: |
+          apk add --no-cache git
+          rm -rf "$GITHUB_WORKSPACE"
+          git clone --depth 1 "${{ gitea.server_url }}/${{ gitea.repository }}.git" "$GITHUB_WORKSPACE"
+          git -C "$GITHUB_WORKSPACE" fetch --depth 1 origin "${{ gitea.sha }}"
+          git -C "$GITHUB_WORKSPACE" checkout "${{ gitea.sha }}"
 
       - name: Read version
         id: meta
         shell: sh
+        working-directory: ${{ gitea.workspace }}
         run: |
           version="$(tr -d ' \n\r' < versions/iperf3.version)"
           artifact="iperf3-${version}-linux-amd64-musl-static"
@@ -33,6 +40,7 @@ jobs:
 
       - name: Build static iperf3
         shell: sh
+        working-directory: ${{ gitea.workspace }}
         run: |
           chmod +x scripts/build_iperf3.sh
           ./scripts/build_iperf3.sh "${{ steps.meta.outputs.version }}" "$PWD/dist"
@@ -46,6 +54,7 @@ jobs:
           REPO_NAME: static-musl-builds
           VERSION: ${{ steps.meta.outputs.version }}
           TARGET_SHA: ${{ gitea.sha }}
+        working-directory: ${{ gitea.workspace }}
         run: |
           python3 scripts/publish_release.py \
             "dist/${{ steps.meta.outputs.artifact }}" \