Move Fedora dependencies for building podman into separate file

This ones listed here are actual for Fedora 31.

Signed-off-by: Anatoli Babenia <anatoli@rainforce.org>

contrib/dependencies.txt

@@ -0,0 +1,34 @@
+# Fedora dependencies for building podman
+
+btrfs-progs-devel
+bzip2
+container-selinux
+containernetworking-cni
+device-mapper-devel
+findutils
+git
+glib2-devel
+glibc-static
+golang
+gpgme-devel
+iptables
+libassuan-devel
+libseccomp-devel
+libselinux-devel
+lsof
+make
+nmap-ncat
+procps-ng
+python
+python3-dateutil
+python3-pip
+python3-psutil
+python3-pytoml
+python3-pyyaml
+python3-varlink
+rsync
+slirp4netns
+unzip
+which
+xz
+zip

contrib/gate/Dockerfile

@@ -1,38 +1,4 @@
 FROM fedora:31
-RUN dnf -y install \
-      btrfs-progs-devel \
-      bzip2 \
-      container-selinux \
-      containernetworking-cni \
-      device-mapper-devel \
-      findutils \
-      git \
-      glib2-devel \
-      glibc-static \
-      golang \
-      gpgme-devel \
-      iptables \
-      libassuan-devel \
-      libseccomp-devel \
-      libselinux-devel \
-      lsof \
-      make \
-      nmap-ncat \
-      procps-ng \
-      python \
-      python3-dateutil \
-      python3-pip \
-      python3-psutil \
-      python3-pytoml \
-      python3-pyyaml \
-      python3-varlink \
-      rsync \
-      slirp4netns \
-      unzip \
-      which \
-      xz \
-      zip \
-      && dnf clean all
 
 ENV GOPATH="/var/tmp/go" \
     GOBIN="/var/tmp/go/bin" \
@@ -43,6 +9,11 @@ ENV GOPATH="/var/tmp/go" \
 # Only needed for installing build-time dependencies, then will be removed
 COPY / $GOSRC
 
+# Install packages from dependencies.txt, ignoring commented lines
+RUN dnf -y install \
+   $(grep "^[^#]" $GOSRC/contrib/dependencies.txt) \
+   && dnf clean all
+
 # Install dependencies
 RUN set -x && \
     mkdir -p "$GOBIN" && \