package: refactor packaging; make builds reproducible; stop requiring git

.github/workflows/reusable-package.yml

@@ -46,6 +46,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
+      - name: Set source date epoch
+        run: |
+          echo "SOURCE_DATE_EPOCH=$(git log -1 --format=%ct "$GITHUB_SHA")" >> "$GITHUB_ENV"
+
       - name: Download pre-built binary
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
@@ -55,22 +59,12 @@ jobs:
       - name: Make binary executable
         run: chmod +x "${BUILD_DIR}/xrpld"
 
-      - name: Generate RPM spec from template
-        if: ${{ inputs.pkg_type == 'rpm' }}
-        env:
-          PKG_VERSION: ${{ inputs.version }}
-          PKG_RELEASE: ${{ inputs.pkg_release }}
-        run: |
-          mkdir -p "${BUILD_DIR}/package/rpm"
-          sed -e "s|@xrpld_version@|${PKG_VERSION}|" \
-              -e "s|@pkg_release@|${PKG_RELEASE}|" \
-            package/rpm/xrpld.spec.in > "${BUILD_DIR}/package/rpm/xrpld.spec"
-
       - name: Build package
         env:
           PKG_TYPE: ${{ inputs.pkg_type }}
           PKG_VERSION: ${{ inputs.version }}
           PKG_RELEASE: ${{ inputs.pkg_release }}
+          SOURCE_DATE_EPOCH: ${{ env.SOURCE_DATE_EPOCH }}
         run: |
           ./package/build_pkg.sh "$PKG_TYPE" . "$BUILD_DIR" "$PKG_VERSION" "$PKG_RELEASE"