docker: Do not configure apt sources.list.

As it is not necessary.

Change-Id: Ic58236dc0da3c24a090c9f05437482b46892f6c5

docker/Dockerfile_debian_10

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_debian_11

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_debian_testing

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_debian_unstable

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_ubuntu_18.04

@@ -11,10 +11,6 @@ RUN apt-get update && \
         g++-8 \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_ubuntu_20.04

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control

docker/Dockerfile_ubuntu_21.04

@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control