alpineでpip3: not foundになったら

pip3 not found エラーがでました

JenkinsでDocker Imageを作成する際に件のエラーが出た。
エラー詳細は下記のような感じ。

変更前のDockerfile

FROM alpine

RUN apk --update-cache add \
    python3 \
    python3-dev \
    gcc \
    g++ \
    curl \
    bash

RUN curl -sSL https://sdk.cloud.google.com | bash
ENV PATH $PATH:/root/google-cloud-sdk/bin

RUN apk update  \
    && apk upgrade  \
    && gcloud components install kubectl

COPY ./requirements.txt /tmp/requirements.txt
RUN pip3 install --upgrade pip
RUN pip3 install -r /tmp/requirements.txt

• コンソールログ
  pip3: not foundエラー

[0m ---> 1532f5abc8b7
Removing intermediate container 43dd3deb5a2a
Step 6/18 : COPY ./requirements.txt /tmp/requirements.txt
 ---> f670b2c8d83b
Step 7/18 : RUN pip3 install --upgrade pip
 ---> Running in eb003063baef
[91m/bin/sh: pip3: not found
[0mThe command '/bin/sh -c pip3 install --upgrade pip' returned a non-zero code: 127
Build step 'Execute shell' marked build as failure
Finished: FAILURE

解決策

py3-pipを入れましょう

変更後のDockerfile

FROM alpine

RUN apk --update-cache add \
    python3 \
    python3-dev \
    py3-pip \
    gcc \
    g++ \
    curl \
    bash

RUN curl -sSL https://sdk.cloud.google.com | bash
ENV PATH $PATH:/root/google-cloud-sdk/bin

RUN apk update  \
    && apk upgrade  \
    && gcloud components install kubectl

COPY ./requirements.txt /tmp/requirements.txt
RUN pip3 install --upgrade pip
RUN pip3 install -r /tmp/requirements.txt

• コンソールログ
  これで問題なく動く

[0m ---> eac6c5580f52
Removing intermediate container bb0aed0b3399
Step 6/18 : COPY ./requirements.txt /tmp/requirements.txt
 ---> 6950ee7fd4a5
Step 7/18 : RUN pip install --upgrade pip
 ---> Running in d21dcaf4353c
Requirement already up-to-date: pip in /usr/lib/python3.8/site-packages (20.1.1)
 ---> c5ac41af673c
Removing intermediate container d21dcaf4353c
Step 8/18 : RUN pip install -r /tmp/requirements.txt
 ---> Running in 327efdaa6d2a
Collecting google-cloud-bigquery
  Downloading google_cloud_bigquery-1.25.0-py2.py3-none-any.whl (169 kB)
Collecting pandas