ci: bring custom cpp image with deps installed

use immawanderer/fedora-cpp with:
* c/cpp dev stuff
* ndpi already compiled and preinstalled (including header files)

consequently, we don't have to use the etc vol.
also, make two final build steps (in each of the build pipelines) run in
parallel, since now they don't access each other's resources (subfolder
magic et al.)

.drone.yml

@@ -18,9 +18,9 @@ steps:
   commands:
   - uname -r; cat /etc/os-release; nproc
 
-- name: pull-fedora:34
+- name: pull-immawanderer/fedora-cpp:linux-amd64
   pull: always
-  image: fedora:34
+  image: immawanderer/fedora-cpp:linux-amd64
   depends_on: [clone]
   commands:
   - uname -r; cat /etc/os-release; nproc
@@ -111,7 +111,7 @@ steps:
   - ldd fastnetmon_api_client
   - ldd fastnetmon_client
   when:
-    status: [success, failure]
+    status: [success]
   depends_on: [build fastnetmon]
 
 - name: fastnetmon subfolder build
@@ -129,8 +129,8 @@ steps:
   - ldd build/fastnetmon_api_client
   - ldd build/fastnetmon_client
   when:
-    status: [success, failure]
-  depends_on: [build fastnetmon explicit features]
+    status: [success]
+  depends_on: [build fastnetmon]
 
 volumes:
 - name: usrcache
@@ -152,45 +152,10 @@ trigger:
   event: [push, pull_request]
 
 steps:
-- name: deps
-  pull: if-not-exists
-  image: fedora:34
-  volumes:
-  - name: etc
-    path: /etc
-  - name: usrcache
-    path: /usr
-  commands:
-  - printf "$SHELL\n"
-  - printf "$PATH\n"
-  - dnf install -y git make {c,auto}make autoconf lld binutils gcc gcc-c++ libgcc libstdc++-{devel,static} glibc-devel openmpi-devel bison flex grpc-{cli,cpp,devel,plugins} protobuf-c-{devel,compiler} protobuf-compiler cppunit log4cpp-devel json-c-devel capnproto-{devel,libs} libpcap-devel hiredis-devel mongo-c-driver-{devel,libs} boost-{devel,atomic,chrono,date-time,system,program-options,regex,thread} libtool libtool-ltdl which pkgconf openssl-devel kernel-devel ncurses-{c++-libs,devel,libs,static}
-  - dnf clean all -y
-
-- name: build-install nDPI
-  pull: if-not-exists
-  image: fedora:34
-  volumes:
-  - name: etc
-    path: /etc
-  - name: usrcache
-    path: /usr
-  commands:
-  - export MAKEFLAGS="$MAKEFLAGS -j$(nproc)" && printf "$MAKEFLAGS\n"
-  - git clone https://github.com/ntop/nDPI.git /usr/src/nDPI
-  - cd /usr/src/nDPI
-  - git checkout 1.7
-  - ./autogen.sh
-  - ./configure
-  - make
-  - make install
-  depends_on: [deps]
-
 - name: build fastnetmon
   pull: if-not-exists
-  image: fedora:34
+  image: immawanderer/fedora-cpp:linux-amd64
   volumes:
-  - name: etc
-    path: /etc
   - name: usrcache
     path: /usr
   commands:
@@ -202,12 +167,11 @@ steps:
   - cmake -DCMAKE_CXX_FLAGS="$CMAKE_CXX_FLAGS -Wall -Werror -Wextra -Wno-reorder -Wno-unused-variable -Wno-unused-parameter -Wno-sign-compare -Wno-unused-but-set-variable -Wno-format-truncation -Wno-implicit-fallthrough -Wno-type-limits -Wno-class-memaccess -Wno-stringop-truncation" .
   - make clean fastnetmon all
   when:
-    status: [success, failure]
-  depends_on: [build-install nDPI]
+    status: [success]
 
 - name: print shared object deps
   pull: if-not-exists
-  image: fedora:34
+  image: immawanderer/fedora-cpp:linux-amd64
   volumes:
   - name: usrcache
     path: /usr
@@ -219,10 +183,8 @@ steps:
 
 - name: build fastnetmon explicit features
   pull: if-not-exists
-  image: fedora:34
+  image: immawanderer/fedora-cpp:linux-amd64
   volumes:
-  - name: etc
-    path: /etc
   - name: usrcache
     path: /usr
   commands:
@@ -234,15 +196,13 @@ steps:
   - ldd fastnetmon_api_client
   - ldd fastnetmon_client
   when:
-    status: [success, failure]
+    status: [success]
   depends_on: [build fastnetmon]
 
 - name: fastnetmon subfolder build
   pull: if-not-exists
-  image: fedora:34
+  image: immawanderer/fedora-cpp:linux-amd64
   volumes:
-  - name: etc
-    path: /etc
   - name: usrcache
     path: /usr
   commands:
@@ -254,12 +214,10 @@ steps:
   - ldd build/fastnetmon_api_client
   - ldd build/fastnetmon_client
   when:
-    status: [success, failure]
-  depends_on: [build fastnetmon explicit features]
+    status: [success]
+  depends_on: [build fastnetmon]
 
 volumes:
 - name: usrcache
   temp: {}
-- name: etc
-  temp: {}
 ...