This PR aims to add `Vary` header in Thumbor response to avoid problems with downstream caches.

Closes https://github.com/thumbor/thumbor/issues/1563
thanks @mpdude 
Should have vary header with auto heif and avif. This PR aims to add `Vary` header in Thumbor response to avoid problems with downstream caches.

Closes https://github.com/thumbor/thumbor/issues/1563
thanks @mpdude 
PNG


IHDR@Y
EiCCPICC profilexڝSgTS=BKKoR RB&*!	J!QEEȠQ,
!{kּ>H3Q5B.@
$pd!s#~<<+"xM0B\t8K@zB@F&S`cbP-`'{[! eDh;VEX0fK9-0IWfH0Q){`##xFW<+*x<$9E[-qWW.(I+6aa@.y24x6_-"bbϫp@t~,/;m%h^uf@Wp~<<EJB[aW}g_Wl~<$2]GLϒ	bG"IbX*QqD2"B)%d,>5j>{-]cK'Xto(hw?G%fIq^D$.Tʳ?D*A,`6B$BB
dr`)B(Ͱ*`/@4Qhp.U=pa(	Aa!ڈbX#!H$ ɈQ"K5H1RT UH=r9\F;2G1Q=C7Fdt1r=6Ыhڏ>C03l0.B8,	c˱"VcϱwE	6wB aAHXLXNH $4	7	Q'"K&b21XH,#/{C7$C2'ITFnR#,4H#dk9, +ȅ3![
b@qS(RjJ4e2AURݨT5ZBRQ4u9̓IKhhitݕNWGw
ǈg(gwLӋT071oUX**|
J&*/TުUUT^S}FU3S	ԖUPSSg;goT?~YYLOCQ_ cx,!k
u5&|v*=9C3J3WRf?qtN	(~))4L1e\kXHQG6EYAJ'\'GgSSݧ
M=:.kDwn^Loy}/TmGX$<5qo</QC]@Caaᄑ<FFi\$mmƣ&&!&KMMRM);L;L֙͢5=12כ߷`ZxZ,eIZYnZ9YXUZ]F%ֻNNgðɶۮm}agbgŮ}}=
Z~sr:V:ޚΜ?}/gX3)iSGggs󈋉K.>.ȽJtq]zۯ6iܟ4)Y3sCQ?0k߬~OCOg#/c/Wװwa>>r><72Y_7ȷOo_C#dz%gA[z|!?:eAAA!h쐭!ΑiP~aa~'W?pX15wCsDDDޛg1O9-J5*>.j<74?.fYXXIlK9.*6nl{/]py.,:@LN8A*%w%
yg"/6шC\*NH*Mz쑼5y$3,幄'L
Lݛ:v m2=:1qB!Mggfvˬen/kY-
BTZ(*geWf͉9+̳ې7ᒶKW-X潬j9<qy
+V<*mOW~&zMk^ʂkU
}]OX/Yߵa>(xoʿܔĹdff-[n
ڴ
VE/(ۻC<e;?TTTT6ݵan{4[>ɾUUMfeI?m]Nmq#׹=TR+Gw-
6
U#pDy	
:v{vg/jBFS[b[O>zG4<YyJTiӓgό}~.`ۢ{cjotE;;\tWW:_mt<Oǻ\kz{f7y՞9=ݽzo~r'˻w'O_@AC݇?[jwGCˆ
8>99?rCd&ˮ/~јѡ򗓿m|x31^VwwO| (hSЧ5tEXtSoftwareAdobe ImageReadyqe<PLTE$$H$$U$U$H$UH$lHU$$$l$UlU$$ll$$ؐH$l$H$$ت$lUlHUتHllHlUllH$U$$HؐU$$l$HllUl$HlU$$UlHUU$H$l$lHشU$llHHHl$UUlU$UHUؐHlHHHlH$lشlH$lHHUHUHUlUlUl$UlllUHHHHUlUت$UUUتl$UllHHHUؐ$HشUlUHUUlU$$UlHlUH$HتlUUH$l$HHUتHت$llUlUlتUH$H$$H$UHHlHHU$l$lH$Ullll$llU$llllHUl$شUH$UH$HUHU$UU$HUH$UHHUHU$Ux
IDATxOl#Zf6Ѵde&J*ٻ#%*
$Ji9w>N5|vrtN1L%
79@-rSɼNqej)	HK2Rog.^{(1XJQ*2D@D@D@$9 R/JP&M)B%Ҝ{h\Б5CW
 flg?)M
R:4x"NiJz%Ch65I1:w.Js<3m>314`IB}:8K;-2k9IGyL'O}|Gk-K8KD@D@D@T`O|[{G6K,fExID@D@D@αYNSIU^f#Ӟ{ǃ\`3<$nb! " " " 0RIENDB`
PNG


IHDR@Y
EiCCPICC profilexڝSgTS=BKKoR RB&*!	J!QEEȠQ,
!{kּ>H3Q5B.@
$pd!s#~<<+"xM0B\t8K@zB@F&S`cbP-`'{[! eDh;VEX0fK9-0IWfH0Q){`##xFW<+*x<$9E[-qWW.(I+6aa@.y24x6_-"bbϫp@t~,/;m%h^uf@Wp~<<EJB[aW}g_Wl~<$2]GLϒ	bG"IbX*QqD2"B)%d,>5j>{-]cK'Xto(hw?G%fIq^D$.Tʳ?D*A,`6B$BB
dr`)B(Ͱ*`/@4Qhp.U=pa(	Aa!ڈbX#!H$ ɈQ"K5H1RT UH=r9\F;2G1Q=C7Fdt1r=6Ыhڏ>C03l0.B8,	c˱"VcϱwE	6wB aAHXLXNH $4	7	Q'"K&b21XH,#/{C7$C2'ITFnR#,4H#dk9, +ȅ3![
b@qS(RjJ4e2AURݨT5ZBRQ4u9̓IKhhitݕNWGw
ǈg(gwLӋT071oUX**|
J&*/TުUUT^S}FU3S	ԖUPSSg;goT?~YYLOCQ_ cx,!k
u5&|v*=9C3J3WRf?qtN	(~))4L1e\kXHQG6EYAJ'\'GgSSݧ
M=:.kDwn^Loy}/TmGX$<5qo</QC]@Caaᄑ<FFi\$mmƣ&&!&KMMRM);L;L֙͢5=12כ߷`ZxZ,eIZYnZ9YXUZ]F%ֻNNgðɶۮm}agbgŮ}}=
Z~sr:V:ޚΜ?}/gX3)iSGggs󈋉K.>.ȽJtq]zۯ6iܟ4)Y3sCQ?0k߬~OCOg#/c/Wװwa>>r><72Y_7ȷOo_C#dz%gA[z|!?:eAAA!h쐭!ΑiP~aa~'W?pX15wCsDDDޛg1O9-J5*>.j<74?.fYXXIlK9.*6nl{/]py.,:@LN8A*%w%
yg"/6шC\*NH*Mz쑼5y$3,幄'L
Lݛ:v m2=:1qB!Mggfvˬen/kY-
BTZ(*geWf͉9+̳ې7ᒶKW-X潬j9<qy
+V<*mOW~&zMk^ʂkU
}]OX/Yߵa>(xoʿܔĹdff-[n
ڴ
VE/(ۻC<e;?TTTT6ݵan{4[>ɾUUMfeI?m]Nmq#׹=TR+Gw-
6
U#pDy	
:v{vg/jBFS[b[O>zG4<YyJTiӓgό}~.`ۢ{cjotE;;\tWW:_mt<Oǻ\kz{f7y՞9=ݽzo~r'˻w'O_@AC݇?[jwGCˆ
8>99?rCd&ˮ/~јѡ򗓿m|x31^VwwO| (hSЧ5tEXtSoftwareAdobe ImageReadyqe<PLTE$$H$$U$U$H$UH$lHU$$$l$UlU$$ll$$ؐH$l$H$$ت$lUlHUتHllHlUllH$U$$HؐU$$l$HllUl$HlU$$UlHUU$H$l$lHشU$llHHHl$UUlU$UHUؐHlHHHlH$lشlH$lHHUHUHUlUlUl$UlllUHHHHUlUت$UUUتl$UllHHHUؐ$HشUlUHUUlU$$UlHlUH$HتlUUH$l$HHUتHت$llUlUlتUH$H$$H$UHHlHHU$l$lH$Ullll$llU$llllHUl$شUH$UH$HUHU$UU$HUH$UHHUHU$Ux
IDATxOl#Zf6Ѵde&J*ٻ#%*
$Ji9w>N5|vrtN1L%
79@-rSɼNqej)	HK2Rog.^{(1XJQ*2D@D@D@$9 R/JP&M)B%Ҝ{h\Б5CW
 flg?)M
R:4x"NiJz%Ch65I1:w.Js<3m>314`IB}:8K;-2k9IGyL'O}|Gk-K8KD@D@D@T`O|[{G6K,fExID@D@D@αYNSIU^f#Ӟ{ǃ\`3<$nb! " " " 0RIENDB`