add samtools to this container?

[byee4]

https://github.com/YeoLab/containers/blob/88f550d6756fa2c99bfd166d65c3d5e26219147e/images/skipper/bedtools_2.31.0/Dockerfile#L25C33-L25C34

Can we add samtools to this Dockerfile and rebuild the container? We'll need it for this Skipper rule:

rule make_scaled_bigwig:
    input:
        CHROM_SIZES,
        bam = lambda wildcards: replicate_label_to_bams[wildcards.replicate_label],
    output:
        bg_plus = temp("output/bedgraphs/scaled/plus/{replicate_label}.scaled.plus.bg"),
        bg_minus = temp("output/bedgraphs/scaled/minus/{replicate_label}.scaled.minus.bg"),
        bw_plus = "output/bigwigs/scaled/plus/{replicate_label}.scaled.plus.bw",
        bw_minus = "output/bigwigs/scaled/minus/{replicate_label}.scaled.minus.bw",
    params:
        error_file = "stderr/{replicate_label}.make_bigwig.err",
        out_file = "stdout/{replicate_label}.make_bigwig.out",
        run_time = "40:00",
        memory = "1000",
        job_name = "make_bigwig"
    benchmark: "benchmarks/bigwigs/unassigned_experiment.{replicate_label}.make_bigwig.txt"
    container:
        "docker://howardxu520/skipper:bedtools_2.31.0"
    shell:
        "factor=$(samtools idxstats {input.bam} | awk '{{sum += $3}} END {{print 10**6 / sum}}');"
        "bedtools genomecov -scale $factor -split -strand + -bg -ibam {input.bam} | sort -k1,1 -k2,2n | grep -v EBV > {output.bg_plus};"
        "bedtools genomecov -scale $factor -split -strand - -bg -ibam {input.bam} | sort -k1,1 -k2,2n | grep -v EBV > {output.bg_minus};"
        "{TOOL_DIR}/bedGraphToBigWig {output.bg_plus} {CHROM_SIZES} {output.bw_plus};" 
        "{TOOL_DIR}/bedGraphToBigWig {output.bg_minus} {CHROM_SIZES} {output.bw_minus};"