Cleanup debug dependencies

Dockerfile

@@ -22,9 +22,6 @@ RUN \
         xmlstarlet \
     && {  \
             [ "$DEBUG" -eq 1 ] \
-            && apt-get install -y \
-                build-essential \
-                imagemagick \
             || true; \
     } \
     && rm -rf /var/lib/apt/lists/
@@ -33,16 +30,23 @@ RUN pip install pyocd
 
 RUN \
     [ "$DEBUG" -eq 1 ] && { \
+        apt-get update; \
+        apt-get install -y \
+                build-essential \
+                imagemagick; \
+        rm -rf /var/lib/apt/lists; \
+        export TIV="$(mktemp)"; \
         git clone https://github.com/stefanhaustein/TerminalImageViewer.git && \
         cd TerminalImageViewer/src/main/cpp && \
         make && \
-        make install && \
+        apt-get remove -y build-essential && \
+        apt-get autoremove -y && \
+        mv tiv "$TIV" && \
         cd - && \
         rm -rf TerminalImageViewer; \
-    } \
+        mkdir -p logs; \
-    || true
+        mkdir -p screens; \
-
+    } || true; \
-RUN \
     printHeading() { \
         local heading; \
         heading="====================================================="; \
@@ -51,11 +55,6 @@ RUN \
         echo "$heading"; \
     }; \
     wget "${KEIL_URL}" --progress=bar:force:noscroll -O MDK537.exe; \
-    [ "$DEBUG" -eq 1 ] && { \
-        mkdir -p logs; \
-        mkdir -p screens; \
-    } \
-    || true && \
     # Handle console output of MDK537 installer
     handle_output() { \
         # A pattern that is supposed to indicates that wine got stuck
@@ -115,7 +114,7 @@ RUN \
                     # Create screenshot and print it to the console
                     fileName="screens/install-try$try-$x.png"; \
                     import -window root "$fileName"; \
-                    tiv -w 10000 -h 10000 "$fileName"; \
+                    "$TIV" -w 10000 -h 10000 "$fileName"; \
                     x="$(expr "$x" + 1)"; \
                     echo "Frame #$x"; \
                     sleep 1; \
@@ -172,10 +171,15 @@ RUN \
         y="$(expr "$y" + 1)"; \
     done && \
     kill -9 "$displayPID" > /dev/null 2>&1; \
-    # Delete unfinished installations
+    # Cleanup Unnecessary Files
+    rm -f "$TIV"; \
     rm -rf "$(/usr/bin/entrypoint winepath 'C:\Keil_v5')/Backup."*; \
     rm MDK537.exe; \
-    rm -f /tmp/.X*-lock;
+    rm -f /tmp/.X*-lock; \
+    [ "$DEBUG" -eq 1 ] && { \
+        apt-get remove -y imagemagick; \
+        apt-get autoremove -y; \
+    }
 
 RUN \
     keilConfig="$(/usr/bin/entrypoint winepath 'C:\Keil_v5\TOOLS.INI')" && \