Set a dummy-version if none set

Make sure the Dockerfiles can be built even if no VERSION build-arg
is passed.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

Dockerfile

@@ -6,7 +6,7 @@ FROM python:${PYTHON_VERSION}
 WORKDIR /src
 COPY . .
 
-ARG VERSION
+ARG VERSION=0.0.0.dev0
 RUN --mount=type=cache,target=/cache/pip \
     PIP_CACHE_DIR=/cache/pip \
     SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION} \

Dockerfile-docs

@@ -13,7 +13,7 @@ RUN addgroup --gid $gid sphinx \
 WORKDIR /src
 COPY . .
 
-ARG VERSION
+ARG VERSION=0.0.0.dev0
 RUN --mount=type=cache,target=/cache/pip \
     PIP_CACHE_DIR=/cache/pip \
     SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION} \

Makefile

@@ -13,7 +13,7 @@ endif
 
 SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER ?= $(shell git describe --match '[0-9]*' --dirty='.m' --always --tags 2>/dev/null | sed -r 's/-([0-9]+)/.dev\1/' | sed 's/-/+/')
 ifeq ($(SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER),)
-	SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER = "dev"
+	SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER = "0.0.0.dev0"
 endif
 
 .PHONY: all

tests/Dockerfile

@@ -28,7 +28,7 @@ RUN curl -sSL -o /opt/docker-credential-pass.tar.gz \
 WORKDIR /src
 COPY . .
 
-ARG VERSION
+ARG VERSION=0.0.0.dev0
 RUN --mount=type=cache,target=/cache/pip \
     PIP_CACHE_DIR=/cache/pip \
     SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION} \