chore(docker): reduce image byte size

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This PR reduces the image byte size 312Mb simply by purging the /tmp dir.

I have also updated the .dockerignore file to target large files present on my local machine during development.

312M	tmp

ls /tmp
07sat.db   7ias.db    dkq65.db   jn4ov.db  r79p.db              w1lt.db
0cb1s.db   84ffw.db   ea52z.db   k04f.db   sd5ml.db             w1q0k.db
1h12.db    84qfc.db   ep3xwl.db  k299g.db  spiex.db             wd8s6.db
20rk8.db   856eg.db   ex34k.db   lbu7.db   taqk2.db             wemh.db
2k2oi.db   8kvx8.db   ey5bt.db   lcbea.db  tb6ei.db             ww4d.db
2t1il.db   8o73th.db  feh1y.db   lceti.db  tl1l.db              x34sb.db
2yzu.db    8o8zg.db   foua.db    lwn8n.db  trcfd.db             x3n7f.db
3a5qn.db   9ex1s.db   gcgi8.db   mlync.db  tvgt.db              x3qkh.db
3e3u.db    9fgj.db    gimu9.db   mmzko.db  tycx8.db             x564.db
403hd.db   9i2p5.db   gmj1i.db   mpvgv.db  typ4d.db             xem74.db
40hvq.db   9m2ab.db   gpdzs.db   ntya.db   u0xnr.db             xnz8.db
45lm.db    9qty.db    h1aqs.db   o2q6z.db  u3jg.db              y2qua.db
5asxm.db   aptlb.db   h75f3.db   o4jpp.db  uf8ls.db             yh5a5.db
5cz9e.db   arf9a.db   hemb6.db   o64x.db   umy9g.db             yuaco.db
5fw6.db    b271.db    hxxur.db   pmcm.db   ut5a.db              yv8h.db
5olxk.db   b7rya.db   ifrge.db   q21o.db   utg.db               ywuhs.db
5rkng.db   ci6yj.db   in95s.db   q5mi.db   uuui9.db             z2vod.db
5w3mpd.db  d5n2s.db   ixpme.db   qh5ew.db  v5w8g.db             zsgas.db
6tady.db   db1ni.db   iydcn.db   qpgjd.db  v8-compile-cache-0/
780bf.db   dkok2.db   jglxo.db   r2wmp.db  vtw5.db

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The improvement is a combination of this change to the baseimage and the change in this PR, the screenshot above display the compressed byte size.

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🎉

pelias/spatial   docker-image-size    df884dd5734b   2 minutes ago    505MB
pelias/spatial   latest               935ed2a92c13   5 weeks ago      1.04GB