Example earthfile for testing weather script

.github/workflows/ci.yml

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+name: Bash-Snippets CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: earthly/actions/setup-earthly@v1
+        with:
+          version: v0.5.10
+      - uses: actions/checkout@v2
+      - name: +lint
+        run: earthly +lint
+  bats:
+    name: bats
+    runs-on: ubuntu-latest
+    steps:
+      - uses: earthly/actions/setup-earthly@v1
+        with:
+          version: v0.5.10
+      - uses: actions/checkout@v2
+      - name: +bats
+        run: earthly +bats

Earthfile

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+alpine:
+    FROM alpine:3.7
+    RUN apk update && apk add bash bats
+    ARG HTTP_CLIENT=""
+    IF [ "$HTTP_CLIENT" = "wget" ]
+        # do nothing, as alpine supplies wget via busybox
+    ELSE
+        IF [ -n "$HTTP_CLIENT" ]
+            RUN apk update && apk add "$HTTP_CLIENT"
+        END
+        RUN unlink /usr/bin/wget # points to busybox by default
+    END
+
+ubuntu:
+    FROM ubuntu:21.04
+    ENV DEBIAN_FRONTEND=noninteractive
+    RUN apt update && apt install -y bats
+    ARG HTTP_CLIENT=""
+    IF [ -n "$HTTP_CLIENT" ]
+        RUN apt update && apt install -y "$HTTP_CLIENT"
+    END
+
+fedora:
+    FROM fedora:34
+    RUN dnf install -qy bats
+    ARG HTTP_CLIENT=""
+    IF [ -n "$HTTP_CLIENT" ]
+        RUN dnf install -qy "$HTTP_CLIENT"
+    END
+
+lint:
+    FROM --platform=linux/amd64 alpine:3.13
+    RUN apk add --update --no-cache shellcheck
+    WORKDIR /snips
+    COPY weather/weather .
+
+    # TODO: once the shellcheck warnings are fixed, remove the echo and --no-cache option.
+    # the echo is included here so we will continue the build, and the --no-cache so that we always run shellcheck
+    # even if the script hasn't changed, so we can print out the warnings.
+    RUN --no-cache shellcheck * || echo "treating all shellcheck issues as warnings rather than failures"
+
+
+test-weather:
+    ARG HTTP_CLIENT=curl
+    ARG OS=ubuntu
+    FROM +$OS
+    WORKDIR /snips
+    COPY --dir weather .
+    RUN mkdir tests
+    COPY tests/weather.bats tests/.
+    IF [ "$OS" = "alpine" ] && [ "$HTTP_CLIENT" = "httpie" ]
+        RUN echo "running weather update on alpine+httpie doesnt work" # TODO remove this once it is fixed.
+    ELSE
+        RUN bats tests/weather.bats
+    END
+
+test-weather-all:
+    BUILD \
+        --build-arg OS=ubuntu \
+        --build-arg OS=alpine \
+        --build-arg OS=fedora \
+        --build-arg HTTP_CLIENT=curl \
+        --build-arg HTTP_CLIENT=wget \
+        --build-arg HTTP_CLIENT=httpie \
+        +test-weather
+
+bats:
+    BUILD +test-weather-all
+
+all:
+    BUILD +lint
+    BUILD +bats