feat: add jsonnet and jsonnet-lint packages

Add RPM packages for jsonnet v0.21.0 built from go-jsonnet:
- jsonnet: main interpreter and jsonnetfmt formatter
- jsonnet-lint: linter for Jsonnet files

Both packages use Go 1.24.7 as required by go-jsonnet v0.21.0.

rpms/jsonnet/Dockerfile

@@ -0,0 +1,19 @@
+# Start with the AlmaLinux 9 base image
+FROM git.unkin.net/unkin/almalinux9-rpmbuilder:latest
+
+# Create output directory for RPMs
+RUN mkdir -p /app/dist
+
+# Set working directory
+WORKDIR /app
+
+ARG PACKAGE_RELEASE
+ENV PACKAGE_RELEASE=${PACKAGE_RELEASE}
+ARG PACKAGE_VERSION
+ENV PACKAGE_VERSION=${PACKAGE_VERSION}
+
+# Copy resources from the context into the container
+COPY resources /app/resources
+
+# Default command to build RPMs
+CMD /app/resources/build.sh