Alpine Linux添加Let's Encrypt CA证书或者自签CA证书
alpinecassl
老杨的博客
进入容器， docker run -it alpine:latest /bin/sh
安装curl， apk --no-cache add curl
对比发现curl依赖ca-certificates，
网上查到update-ca-certificates命令为更新系统ca证书，
经过操作总结，发现有2种方式添加ca证书至系统内，以下示例：
/usr/local/share/ca-certificates/将Let's Encrypt Authority X3的CA证书Letsencrypt_Root_CA.crt放至目录/usr/local/share/ca-certificates/下，并执行update-ca-certificates，即可完成证书更新。
-----BEGIN CERTIFICATE-----
MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/
MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
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GkxldCdzIEVuY3J5cHQgQXV0aG9yaXR5IFgzMIIBIjANBgkqhkiG9w0BAQEFAAOC
AQ8AMIIBCgKCAQEAnNMM8FrlLke3cl03g7NoYzDq1zUmGSXhvb418XCSL7e4S0EF
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/PIzark5McWvxI0NHWQWM6r6hCm21AvA2H3DkwIDAQABo4IBfTCCAXkwEgYDVR0T
AQH/BAgwBgEB/wIBADAOBgNVHQ8BAf8EBAMCAYYwfwYIKwYBBQUHAQEEczBxMDIG
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Y3JsMB0GA1UdDgQWBBSoSmpjBH3duubRObemRWXv86jsoTANBgkqhkiG9w0BAQsF
AAOCAQEA3TPXEfNjWDjdGBX7CVW+dla5cEilaUcne8IkCJLxWh9KEik3JHRRHGJo
uM2VcGfl96S8TihRzZvoroed6ti6WqEBmtzw3Wodatg+VyOeph4EYpr/1wXKtx8/
wApIvJSwtmVi4MFU5aMqrSDE6ea73Mj2tcMyo5jMd6jmeWUHK8so/joWUoHOUgwu
X4Po1QYz+3dszkDqMp4fklxBwXRsW10KXzPMTZ+sOPAveyxindmjkW8lGy+QsRlG
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KOqkqm57TH2H3eDJAkSnh6/DNFu0Qg==
-----END CERTIFICATE-----
/usr/share/ca-certificates/将Let's Encrypt Authority X3的CA证书Letsencrypt_Root_CA.crt放至目录/usr/share/ca-certificates/下，在文件/etc/ca-certificates.conf中配置引用路径，并执行update-ca-certificates，即可完成证书更新。
从curl命令过程可以看出，/etc/ssl/certs/ca-certificates.crt是最终生效的CA文件，因此，可以将CA证书的内容直接添加进此文件。update-ca-certificates其实也就是干的这件事，在没有此命令时，直接添加内容至CA文件中是最好的选择。
以下是gitlab-runner不支持letsencrypt证书解决办法：
Dockerfile
FROM gitlab/gitlab-runner:alpine-v11.11.2
USER root
COPY Letsencrypt_Root_CA.crt /usr/local/share/ca-certificates/
RUN apk --no-cache add ca-certificates \
&& rm -rf /var/cache/apk/* \
&& update-ca-certificates
USER gitlab-runner
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